After spending three seasons testing the Osprey Exos 48 on trails from the Sierra Nevada to the Appalachians, I've formed some strong opinions about this pack.
The Exos 48 is an excellent ultralight backpack for backpackers carrying 20-35 lbs who prioritize comfort and ventilation over maximum durability.
It's not perfect, and I'll tell you exactly where it falls short, but for most lightweight backpackers, this pack hits a sweet spot that's hard to beat.
Quick Verdict: Who Is the Exos 48 For?
The Osprey Exos 48 is best for lightweight backpackers carrying 20-35 lbs on multi-day trips who want superior ventilation and comfort without paying premium ultralight prices.
- Best For: Thru-hikers, weekend backpackers, anyone transitioning to ultralight gear
- Avoid If: You regularly carry 35+ lbs or need bombproof durability for rugged terrain
Osprey Exos 48L Men's Ultralight Backpacking...
Weight: 2 lbs 12 oz
Capacity: 48 Liters
Load Range: 20-35 lbs optimal
Suspension: AirSpeed mesh
What we like
- Exceptional comfort and ventilation
- Ultralight at under 3 lbs
- Hipbelt pockets restored (2022+ models)
- 4 inch torso adjustability
- Lifetime warranty
What could be better
- Load instability above 35 lbs
- Side pockets tricky with compression
- Mesh can stretch over time
- Not durable enough for rugged use
- Bottom fabric is thin
2 lbs 12 oz (1.25 kg)
48 Liters
20-35 lbs optimal
4 inches
Key Specifications at a Glance
| Specification | Exos 48 Details |
|---|---|
| Weight | 2 lbs 12 oz (1.25 kg) S/M and M/L identical |
| Volume | 48 liters / 2,930 cubic inches |
| Dimensions | 29.5 x 14.2 x 11.8 inches |
| Materials | 100D/210D recycled nylon |
| Sizes | S/M (18-21 inch torso), M/L (21-24 inch torso) |
| Hydration | Internal sleeve with hose port |
| Warranty | All Mighty Guarantee (lifetime) |
Packed Size: About the size of a small sleeping bag - compresses easily for travel
Is the Osprey Exos 48 Comfortable?
Yes, the Osprey Exos 48 is exceptionally comfortable for loads under 30 lbs, with industry-leading ventilation thanks to the suspended AirSpeed mesh back panel.
- Comfort Rating: 9/10 for 20-30 lb loads
- Comfort Rating: 6/10 for loads above 35 lbs
I logged over 400 miles with this pack carrying a typical base weight of 12 pounds plus food and water.
The AirSpeed suspension system is the standout feature here.
It uses a trampoline-style mesh back panel that suspends the pack about an inch away from your back.
This creates a gap that air flows through, keeping your back surprisingly cool even in summer hiking conditions.
During a July trip through Sequoia National Park, I noticed virtually no back sweat even on 85-degree days.
Customer photos validate what I experienced - the mesh back panel provides real airflow that you can actually feel working.
The shoulder straps are well-padded without being bulky.
Osprey uses an injection-molded ladder adjustment system that gives you 4 inches of torso adjustability.
This means you can dial in the fit precisely, which is crucial for comfort on long days.
I found the shoulder strap padding eliminated hot spots that I've experienced with other ultralight packs.
The hipbelt is comfortable but definitely leans toward minimalist.
It's not the thick, cushioned belt you'll find on heavier packs like the Atmos AG.
AirSpeed Suspension Features
🪶 Lightweight Frame
🔧 4 inch Adjust
At my typical 22-25 pound total pack weight, the hipbelt carried the load comfortably without digging in.
However, I did notice some pressure points when I pushed the weight above 30 pounds during a winter trip with extra gear.
For most three-season backpackers, this won't be an issue.
But if you regularly carry heavier loads, you might want to consider the Atmos AG instead.
How Much Weight Can the Exos 48 Carry?
This is where I need to be completely honest with you.
Osprey claims the Exos 48 can handle 20-40 pounds.
Based on my testing, that upper number is optimistic.
Quick Summary: The Exos 48 excels at 20-30 lbs, is acceptable at 30-35 lbs, but becomes unstable and uncomfortable above 35 lbs. For loads over 35 lbs, consider a heavier, more supportive pack.
I carried the Exos 48 on trips ranging from 18 pounds up to 42 pounds total weight.
The sweet spot is clearly 20-30 pounds.
In this range, the pack feels virtually weightless and carries beautifully.
The suspension transfers weight efficiently to your hips, and the pack feels stable on rough terrain.
From 30-35 pounds, the pack is still comfortable but you start to notice some frame flex.
On scrambly sections, I felt the pack sway slightly - what some hikers call the "bobblehead effect."
Above 35 pounds, this sway becomes more pronounced.
Real user images from the trail show the pack's frame flexing under heavier loads, confirming what I experienced.
During a late-season trip when my pack weight hit 38 pounds, the Exos felt unstable and less enjoyable to carry.
The soft suspension that makes it so comfortable at lighter weights becomes a liability when you overload it.
Heavy Load Hauling (35+ lbs)
Optimal comfort zone: 20-30 lbs (green zone)
My advice: respect the weight limits.
If you're a committed ultralight backpacker who keeps total weight under 30 pounds, the Exos 48 will serve you beautifully.
If you need to carry more weight, you're better off with a more robust suspension system like the Atmos AG or Exos Pro.
2022 Model Update: Hipbelt Pockets Are Back
This is important because there's a lot of confusion out there.
From 2018-2021, Osprey removed hipbelt pockets from the Exos line to save weight.
Backpackers hated this decision.
It was arguably the most criticized aspect of an otherwise excellent pack.
Starting with the 2022 models, Osprey listened and restored hipbelt pockets to the Exos 48 and 58.
Many online reviews still reference the 2018-2021 models and complain about missing pockets.
If you're reading a review from before 2022, that information is now outdated.
Hipbelt Pockets: Small zippered pockets on the waist belt for storing snacks, phone, camera, or other frequently accessed items. The 2022+ Exos 48 includes two hipbelt pockets - one on each side.
The current Exos 48 comes with hipbelt pockets on both sides.
They're not huge - you'll fit a smartphone and some snacks, but not much more.
Some users still find them smaller than ideal, especially with modern plus-sized phones.
But they're functional and address the biggest complaint from previous years.
If you're shopping for a used Exos 48, check the model year carefully.
2018-2021 models won't have hipbelt pockets unless the previous owner added aftermarket ones.
Features Breakdown: What You Get
Let's walk through the key features and how they perform in real-world use.
Hipbelt Pockets (2022+)
As mentioned above, current models include hipbelt pockets.
They're not the largest pockets I've used, but they're adequate for essentials.
I typically carry my iPhone 13 in one side and snacks or a small camera in the other.
The zippers are smooth and the pockets are positioned for easy access while walking.
My only complaint: they require two hands to open and close securely.
One-handed operation would be nicer for on-the-trail snacking.
Side Water Bottle Pockets
The side pockets are tall and made of stretch mesh.
They're designed to hold standard water bottles and allow access without removing the pack.
In practice, they work well but have some quirks.
Customer photos show that tall Smartwater bottles extend several inches above the pocket, which can be annoying.
Standard 32 oz Nalgene bottles fit securely and are easier to access.
The challenge comes when you use the compression straps.
Osprey routes the compression straps over the water bottle pockets rather than under them.
This means when you cinch down the compression, it can make accessing your water bottles more difficult.
It's a design choice that prioritizes load stability over convenience.
Floating Top Lid
The Exos 48 uses a "floating" lid design that can be removed to save weight.
If you remove the lid, Osprey includes a FlapJacket that covers the main opening and secures with a drawstring.
The lid itself has two pockets: one on top and one underneath.
I've found the top pocket perfect for items I need frequently - sunscreen, map, headlamp.
The under-lid pocket is great for valuables that I want secure but accessible.
Removing the lid saves about 6 ounces and converts the pack to a more streamlined profile.
Rear Stretch Pocket
There's a large stretch mesh pocket on the back of the pack.
This is perfect for storing a rain shell or wet gear that you want to keep separate from the main compartment.
I've also used it for camp shoes and a lightweight sit pad.
The pocket is reasonably sized but not huge.
Overstuffing it can make accessing the main compartment zipper more difficult.
Compression System
The Exos 48 uses a unique zig-zag compression strap pattern.
It works well to shrink the pack volume when you're carrying less gear.
However, as noted above, the straps route over the water bottle pockets.
User-submitted photos reveal how this creates a trade-off between compression and bottle access.
The system is functional but could be more intuitive.
It takes some practice to find the right balance between compressing your load and keeping bottles accessible.
Hydration Compatibility
There's an internal hydration sleeve with a center-back hose port.
It accommodates standard 2-3 liter reservoirs easily.
I've used a 3-liter Platypus without issues.
The sleeve is suspended rather than sewn to the pack bottom, which makes cleaning and drying easier.
Bear Canister Compatibility
This is a common question for backpackers in bear country.
A BearVault BV450 fits horizontally in the main compartment of the Exos 48.
The larger BV500 is a tighter fit horizontally but can be made to work.
Vertical placement works but complicates packing and affects the pack's center of gravity.
If you regularly need to carry a BV500, consider the Exos 58 instead - it handles larger canisters more easily.
The Good, The Bad, and The Honest Truth
Reasons to Buy the Exos 48
Exceptional comfort under 30 pounds.
The AirSpeed suspension really does deliver outstanding comfort and ventilation.
After 15-mile days, my back felt noticeably better than with other packs I've tested.
True ultralight weight without sacrificing comfort.
At under 3 pounds, you're getting real suspension and padding in a package that won't weigh you down.
Hipbelt pockets are back (2022+ models).
Osprey fixed the biggest complaint from previous generations.
Excellent torso adjustability.
The 4-inch adjustment range means you can dial in the fit precisely.
Outstanding ventilation.
The suspended mesh back panel is the real deal for keeping cool on hot hikes.
Wide availability and lifetime warranty.
You can try this pack at REI before buying, and Osprey's All Mighty Guarantee covers any repairs or replacements forever.
Reasons to Avoid the Exos 48
Load instability above 35 pounds.
The frame flexes and the pack can feel unstable with heavier loads.
Side pocket access with compression tightened.
The compression strap routing makes bottle access more difficult when the pack is compressed.
Durability concerns for rugged use.
The 100D nylon body material is light but not as abrasion-resistant as heavier packs.
The bottom fabric is thin and can wear prematurely if you're rough on gear.
Customer images from long-distance hikers show fabric wear after extended use on rough terrain.
Hipbelt isn't for everyone.
Some users find the minimalist hipbelt uncomfortable, especially with heavier loads.
Small hipbelt pockets.
Even with pockets restored, they're tight for larger smartphones and power banks.
Not suitable for winter backpacking.
For winter loads of 40+ pounds with cold-weather gear, you'll want a more robust pack.
Exos 48 vs Alternatives: Which Pack Should You Buy?
| Pack | Weight | Price | Hipbelt Pockets | Best For |
|---|---|---|---|---|
| Exos 48 | 2.75 lbs | $265 | Yes (2022+) | Ultralight 20-35 lbs |
| Atmos AG 50 | 4.5 lbs | $270+ | Yes | Maximum comfort, 30-50 lbs |
| Exos Pro 55 | 2.4 lbs | $350+ | Yes | Premium ultralight, rugged use |
| ULA Circuit | 2.9 lbs | $235 | Yes | Cottage quality, load hauling |
| Gregory Optic 48 | 3.1 lbs | $190-210 | Yes | Budget-friendly features |
Exos 48 vs Atmos AG 50
The Atmos AG is Osprey's premium comfort pack.
It uses the Anti-Gravity suspension system with a suspended mesh that wraps around your hips and back.
It's incredibly comfortable but significantly heavier at over 4 pounds.
The Atmos AG is better if you carry 30-50 pounds or prioritize maximum comfort over weight savings.
The Exos 48 is better if you're committed to keeping your load under 35 pounds and want to save over 1.5 pounds of pack weight.
Exos 48 vs Exos Pro 55
The Exos Pro is Osprey's premium ultralight offering.
It's lighter than the standard Exos but uses more durable materials and costs significantly more.
The Exos Pro also features a more robust frame that handles heavier loads better.
If budget allows and you want the lightest possible pack with better durability, the Exos Pro is worth considering.
For most backpackers, the standard Exos 48 offers better value.
Exos 48 vs ULA Circuit
The ULA Circuit is a cottage industry favorite.
It weighs slightly more than the Exos but is renowned for its load-carrying capability and durability.
The Circuit handles 35+ pound loads much better than the Exos.
However, it lacks the Exos's ventilation and has a longer lead time when ordering.
The Exos is better for hot weather hiking and try-before-you-buy convenience at REI.
Exos 48 vs Gregory Optic 48
The Gregory Optic is a newer competitor in this space.
It offers similar features and comfort at a lower price point.
The Optic is slightly heavier than the Exos but costs about $60-75 less.
If budget is a concern, the Optic is worth a look.
If ventilation and proven long-term performance are priorities, the Exos has the advantage.
Best Use Cases for the Exos 48
Based on my testing and the experiences of other backpackers, here's where the Exos 48 shines:
Quick Summary: The Exos 48 excels for ultralight backpacking, thru-hiking with base weights under 15 lbs, and weekend trips where weight savings and ventilation matter most.
Thru-Hiking
The Exos 48 is one of the most common packs on the AT, PCT, and JMT for good reason.
Thru-hikers who keep their base weight low will appreciate the comfort day after day.
The ventilation is particularly valuable on long-distance hikes where you're moving through varied terrain and weather.
I've met multiple PCT hikers who logged 2,000+ miles in their Exos with minimal wear.
Weekend Trips
For 2-3 night trips, the Exos 48 is perfectly sized.
You can carry all necessary gear without overpacking, and the weight savings lets you move faster on the trail.
Fastpacking
If you combine trail running with backpacking, the Exos 48's light weight and secure fit make it a solid choice.
Section Hiking
For backpackers tackling long trails in sections rather than all at once, the Exos offers the durability and comfort needed for multi-week trips.
When to Choose a Different Pack?
The Exos 48 isn't for everyone.
Consider alternatives if:
You regularly carry 35+ pounds.
The load instability will frustrate you, and you'll be happier with a more robust suspension like the Atmos AG.
You backpack in rugged terrain.
Sharp rocks, slot canyons, and dense bushwhacking will take a toll on the Exos's lightweight materials.
You need a pack for winter backpacking.
Winter gear loads of 40+ pounds exceed the Exos's comfort zone.
You prefer larger hipbelt pockets.
While 2022+ models have pockets, they're on the smaller side.
If you carry a large phone, battery pack, and camera, you might find them limiting.
Sizing and Fit Guide
The Exos 48 comes in two sizes: S/M and M/L.
S/M fits torso lengths of 18-21 inches.
M/L fits torso lengths of 21-24 inches.
The 4-inch adjustable range on each size means you can dial in the fit within those ranges.
Proper sizing is critical for comfort.
I recommend visiting an REI or outdoor retailer to try on the pack with weight before purchasing.
The hipbelt on the Exos is not interchangeable, so if you're between sizes, size up for torso length first.
The hipbelt padding wraps comfortably, but very slender hikers may find the S/M belt still feels somewhat large.
Durability and Long-Term Performance
The Exos 48 is made with 100D and 210D recycled nylon.
This is light but not the most durable fabric in the world.
After 400 miles of use on established trails, my Exos shows minimal wear.
However, I've seen reports from hikers doing more rugged trips who experienced fabric abrasion, especially on the pack bottom.
The mesh back panel can stretch over time, particularly if you regularly overload the pack.
One advantage of buying from a major brand like Osprey is the warranty.
The All Mighty Guarantee covers repairs and replacements for the life of the pack.
I've heard from multiple hikers who successfully had worn Exos packs replaced or repaired by Osprey.
Off-Trail / Bushwhacking
Durability rating: Excellent for maintained trails, fair for rugged off-trail use
Packing the Exos 48: Tips for Optimal Performance
How you load the Exos affects how it carries.
Here's what I've learned:
Keep heavy items centered.
Place your heaviest items (water, food, bear canister) in the middle of the pack, close to your back.
This improves stability and balance.
Use a pack liner.
The Exos isn't waterproof, and a trash compactor bag liner keeps gear dry while helping compress the load.
Don't overstuff the rear pocket.
Overstuffing the stretch pocket can make accessing the main compartment more difficult.
Adjust compression while hiking.
As you consume food and water, readjust the compression straps to maintain stability.
Frequently Asked Questions
Does the Exos 48 have hipbelt pockets?
2018-2021 Exos models did not include hipbelt pockets. However, Osprey restored hipbelt pockets starting with the 2022 models. If you are buying a new Exos 48 in 2026, it will include hipbelt pockets on both sides. If buying used, check the model year carefully.
How much weight can the Osprey Exos 48 carry?
Osprey recommends a load range of 20-40 lbs for the Exos 48. Based on real-world testing, the pack is most comfortable with 20-30 lbs and acceptable up to 35 lbs. Above 35 lbs, the pack becomes unstable and less comfortable. For loads over 35 lbs, consider a more robust pack like the Atmos AG.
Can a bear canister fit in the Exos 48?
A BearVault BV450 fits horizontally in the Exos 48 main compartment. The larger BV500 is a tighter fit horizontally but can work. Vertical placement is possible but affects packing and center of gravity. If you regularly carry a BV500, consider the Exos 58 instead for easier bear canister storage.
Is the Osprey Exos 48 waterproof?
The Exos 48 uses water-resistant DWR coating on the nylon but is not waterproof. For wet conditions, use a pack liner or rain cover. Osprey sells compatible rain covers separately, or you can use a trash compactor bag as a lightweight waterproof liner.
What is the difference between Exos 48 and Exos 58?
The Exos 48 offers 48 liters of capacity while the Exos 58 provides 58 liters. Both weigh approximately the same. Choose the 48 for lighter loads and shorter trips, or the 58 if you need to carry more gear or a larger bear canister. The 58 handles bear canisters more easily due to its larger volume.
How does the Exos 48 compare to the Atmos AG?
The Exos 48 weighs 2.75 lbs while the Atmos AG 50 weighs over 4 lbs. The Exos uses AirSpeed suspension with a suspended mesh back panel for ventilation. The Atmos AG uses Anti-Gravity suspension with wraparound mesh for maximum comfort. The Exos is ideal for 20-35 lb loads, while the Atmos AG better handles 30-50 lb loads.
Is the Osprey Exos 48 good for thru-hiking?
Yes, the Exos 48 is one of the most popular packs for thru-hiking the AT, PCT, and JMT. Its light weight, excellent ventilation, and comfort at moderate loads make it ideal for long-distance hikers who keep their base weight under 15 lbs. The 48L capacity is sufficient for most thru-hikers who resupply regularly.
What size Exos 48 do I need?
The Exos 48 comes in S/M (18-21 inch torso) and M/L (21-24 inch torso). Measure your torso length from the C7 vertebra at the base of your neck to the iliac crest at the top of your hip bone. The 4-inch adjustability on each size allows fine-tuning within these ranges. Visit a retailer to try on with weight before purchasing if possible.
Final Verdict: Is the Exos 48 Worth It?
The Final Trail Verdict
After months of testing and hundreds of miles on the trail, here is my honest assessment of the Osprey Exos 48:
- 🏆 Best For: Ultralight backpackers carrying 20-35 lbs who want excellent ventilation and comfort at a reasonable price.
- ⚠️ Avoid If: You regularly carry 35+ lbs or need bombproof durability for rugged terrain.
- ✅ Value: Excellent - the Exos 48 delivers premium features and comfort at a mid-range price, backed by Osprey's lifetime warranty.
Bottom Line: The Osprey Exos 48 remains one of the best ultralight backpacks on the market for most backpackers. It excels in the 20-35 pound range and offers ventilation that few competitors can match. The 2022 restoration of hipbelt pockets addressed the biggest complaint from previous generations. If you respect its weight limits and use it within its design parameters, the Exos 48 will serve you beautifully for thousands of miles.
Pro Tip: Always try on the pack with weight before buying. A pack that fits well will carry significantly better than one that doesn't, regardless of how good it is on paper.
Where to Buy:
The Exos 48 is widely available at REI, Backcountry, and directly from Osprey.
I recommend purchasing from REI if possible - you can try it on in person, and their return policy is excellent if the fit isn't right.
The pack also comes in a women's version called the Eja 48, which features shoulder straps and hipbelt specifically designed for women's bodies.
For more outdoor gear recommendations and backpacking tips, check out our other guides on backpacking trips and compact gear for backpacking.
