The Osprey Exos Pro 55 combines superb comfort and a light weight that make it a solid choice for ultralight hikers.
The Osprey Exos Pro 55 with the top pouch removed and the top flap covering the pack opening.
Overview: Osprey Exos Pro
MSRP: $290
Weight: 2.077 pounds for S/M; 2.165 pounds for L/XL.
Capacity: 55 liters for S/M; 58 liters for L/XL.
Fabric: The main compartment and bottom of the pack use Osprey’s proprietary NanoFly fabric and a mix of 100D nylon and 200d UHMWPE (ultra-high-molecular-weight polyethylene) ripstop. The fabric’s durable water repellent (DWR) treatment is made without environmentally harmful PFAS.
Note: The pack is also available as the women’s Eja Pro.
The Exos Pro has 5 ladder-style slots for moving the pack up or down on the frame, and the mesh panel is extremely comfortable.
About the Osprey Exos Pro 55
Osprey makes a successful dive into the ultralight market with the Exos Pro 55, cutting nearly one pound off the trail-tested Exos 58 without sacrificing comfort. The ventilated AirSpeed back panel is comfortable and puts cooling air between the pack and my back, unlike most ultralight packs that rest against my back with little ventilation and can get hot.
Exos Pro 55 Carrying Capacity
Main Compartment: The top-loading main compartment holds all my gear for a five-day hike: tent, sleeping bag, clothes, accessories, and bear canister with food. The bear canister fits into the pack horizontally or vertically, or it can be strapped to the top underneath the floating top pouch.
Front Mesh Pocket: Smaller than mesh pockets in other packs in the Pro 55’s weight category, but it still has enough room for my water filter, lunch, and a lightweight rain coat. Overloading the main compartment, creating a bulge, cuts into the storage capacity of the mesh pocket.
Side Pockets: A mesh pocket on each side of the pack can each hold two narrow water bottles or tent poles. There’s a large gap in the side of the fabric where the pockets attach to the frame, and I worry that small gear like a water filter could slip out through the gap.
Two Hipbelt Pockets: One pocket with a zipper can hold small items, in my case two granola bars and a small bottle of hand sanitizer. The other pocket is open, and I take care that anything I put in it doesn’t fall out.
Top Pocket and Flap: The Pro 55 has two top closures: a floating pouch with a zipper and a flap under the pouch. The flap can be tucked into the pack if you’re using the top pouch, or the pouch can be removed and the flap becomes the top pack closure. I prefer to remove the top pouch, reducing carrying capacity by 9 liters and the weight by almost 3 ounces.
Water Bladder: A clip inside the pack marked H20 holds an internal hydration sleeve.
Bear Canister: My BearVault 450 fits horizontally or vertically inside the main body of the pack, or it can be strapped to the top of the pack, held in place by the top pocket. I found that putting the bear can horizontally on top of my tent at the bottom of the pack was the most comfortable spot.
The top pouch gives easy access to gear and adjusts to fit over a bear canister. It can be removed for a weight savings.
Exos Pro 55 Comfort
Fit: The Pro 55 comes in two sizes: small/medium and large/extra large. The frame has five adjustment slots to move the pack up and down 4 inches to accommodate different heights, and the hipbelt adjusts for different waist sizes. I’m 5 feet, 10 inches tall and have my pack on the second slot from the top.
Suspension: Osprey’s AirSpeed suspension provides superb comfort and ventilation. The pack rides comfortably on my back without any pressure from gear stored inside.
Load Lifters: Consistent with Osprey’s effort to keep features included on mainstream packs, the Pro 55 has load lifters that keep the weight close to my back.
How Much Weight?: The Pro 55 is extremely comfortable at about 20 pounds, the weight that I usually carry. Osprey recommends a maximum weight of 30 pounds.
External Essentials
Floating Top Lid: This is the classic top lid on most mainstream backpacks, with a key clip inside and adjustable straps to fit a bear can on top of the pack. The lid can be removed to save a few ounces and the pack’s top can be closed with a fixed flap.
Side Compression Cords: These cords do double duty to compress the pack and hold equipment such as trekking poles to the side of the pack. The straps are long enough to lash bulky gear to the sides of the pack, and though the buckles are small and the straps thin, the buckles are easy to connect and disconnect, and the straps slide easily and don’t slip loose. The straps also slide through small loops on the sides of the pack so they aren’t flapping around.
Shoulder Straps: The Pro 55 does not come with shoulder strap pockets, though it does have loops to attach pockets. Because the hip belt pockets are not large enough to hold my phone, I bought a shoulder strap pocket to store it.
Emergency Whistle: The sternum-strap emergency whistle has become ubiquitous on most packs.
Water Bladder: A hydration bladder fits between the pack and the frame, hung from a fixed strap.
Trekking poles or tent poles can be lashed to the side of the pack.
Pack Material
Fabric: The UHMWPE (ultra-high-molecular-weight polyethylene) is a high-abrasion, water-resistant and lightweight fabric, while the NanoFly fabric adds durability and water resistance. I’ve done some light bushwhacking in the Pro 55 and didn’t get any tears.
Rainy Days: The pack’s fabric has a durable water repellent treatment, but the extent of the water resistance is limited. My pack was soaked through after hiking an afternoon in the rain, although my gear stuffed into water resistant bags stayed dry inside.
My Take
Osprey’s AirSpeed suspension is the key to the Exos Pro 55, providing back comfort and ventilation. I can’t say it enough: This pack rides like a dream. The outside mesh pockets aren’t as large as those on some other packs in this class, but I wouldn’t call that a deal breaker. I would worry about rough off-trail use or butt-sliding down rocks because the pack’s fabric is thin.
Exos Pro 55 Pros
Lightweight: The Exos Pro 55 weighs about a pound less than the trail-proven Exos 58.
Comfort: The AirSpeed mesh back panel is comfortable and ventilated.
Easy to Adjust the Frame: The Pro 55 comes in two sizes (small/medium and large/extra large) and the frame is easy to adjust for a comfortable fit.
Warranty: Osprey’s All Mighty Guarantee is legendary, and the company says it 100% covers accidental damage: Any Pack, Any Reason, Any Era.
Exos Pro 55 Cons
Durability: Osprey uses a thin fabric for the Exos Pro 55, but so far it is holding up.
Exterior Storage: The outer mesh pockets are small, and their carrying capacity shrinks if the pack is loaded to the bulging point.
Overall Value
Why would I recommend buying the Exos Pro 55? Comfort, comfort, comfort. At the end of the day my back felt just as good as it did when I put on the pack in the morning. And though the $290 price is a lot of money, it doesn’t come near the price of other ~2-pound packs that use Dyneema and Ultra fabrics. The Exos isn’t highly water resistant and its outside pockets are small, but for someone entering the ultralight market—or even someone already going ultralight—the Pro 55 is a solid buy.
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This product was donated for purpose of review.