Osprey Kestrel 48 Review: The Right Size Pack for Most Multiday Hikes

The 48-litre pack is the sweet spot for multiday hiking and barely anyone talks about it. Too big to justify for a day out, too small to let your poor packing decisions spiral out of control. The Kestrel 48 sits right in that range and handles most things well.

Price: from around £140

What 48 Litres Gets You

A 48L pack comfortably fits everything needed for a multiday summer trip with a tent and a light two-season sleeping bag. Push into colder conditions with a bulkier four-season bag and it still works if you’re staying in huts or strapping your tent to the outside of the pack.

The only situations where going bigger makes sense: carrying more than a couple of days of food on a remote route with no resupply, or hauling gear for more than one person. For the vast majority of backpacking trips, 50 litres is the ceiling of what you need. Anything larger and you’re carrying the extra volume rather than using it.

The Features Worth Knowing About

AirScape back panel: The main design decision in the Kestrel. The back panel sits in contact with your back rather than using a suspended mesh frame. The trade-off is simple: you lose the airflow of a suspended mesh system and your back will sweat more, but you gain stability and a lower centre of gravity because the load sits tighter to your body. On technical terrain or with a heavy load, that stability earns its keep. On a flat trail in summer heat, you’ll miss the mesh. Which matters more depends entirely on where and how you hike.

Side pocket and quick-entry zip: The most practically useful features on this pack, and the ones you’ll notice most in daily use. The side pocket lets you reach snacks, a filter, or a rain jacket without opening the main compartment. The quick-entry zip on the opposite side of the pack gives you access to the main compartment without unpacking everything sitting above it. Simple ideas, done well, and you feel their absence immediately on packs that don’t have them.

Attachment points and bungees: Loops, lash points, and bungees across the front and sides handle a wet rain jacket, trekking poles, or anything bulky you’d rather not pack inside. Useful without being excessive.

Hip belt pockets: Standard on Osprey packs at this level. Large enough for a phone and snacks. You stop noticing them when they’re there. You’d notice them immediately if they weren’t.

Fit and sizing: The Kestrel comes in multiple torso sizes and the hip belt transfers load well when fitted properly. Getting the fit right matters more than almost any other spec. A well-fitted 40L is more comfortable under a heavy load than a poorly-fitted 60L every time. If possible, try it in a shop with some weight in it before buying.

Other bits: The built in raincover with a dedicated pocket comes as standard on these sort of packs which is always handy. Also useful is the ‘brain’ of the pack which has one internal pocket and one external pocket which is great for organising small bits of kit and can hold a surprisingly large amount of stuff. Another great feature is the front stretch pocket where you can stuff things such as a jacket which you might need to pop on without opening your pack or wet gear you want to air dry.

The Osprey Guarantee

Osprey’s All Mighty Guarantee covers repair or replacement for any damage or defect for the lifetime of the product, regardless of when you bought it or whether you’re the original owner. For a pack that will take real punishment over years of use, that’s not small print. It’s the main reason to choose Osprey for a large pack over a cheaper alternative. Buy it once, use it hard, and if something fails, Osprey sorts it.

What I’d Buy Now

If buying a multiday pack today and not planning to use it constantly, the Osprey Rook 50 (men’s) or Renn 50 (women’s) is where I’d start. Both sit lower in the Osprey range, cost noticeably less from around £120, and still carry the same lifetime guarantee. The core job of the pack is the same. If you’re not heading out every other weekend, the price difference between the Rook and the Kestrel is hard to justify.

Two other packs worth looking at depending on your priorities:

Osprey Fairpoint / Fairview 50: A hybrid pack designed to work for both hiking and travel. The harness stows away completely so it can be checked in without straps getting chewed up on a baggage carousel. If your multiday hiking trips regularly start with a flight, this is the smarter buy. Less technical on trail but considerably more versatile overall.

Osprey Atmos AG 50: The step up from the Kestrel. The Anti-Gravity suspension system uses suspended mesh rather than the AirScape contact panel, so your back breathes significantly better. From around £160, heavier than the Kestrel, but if a sweaty back is your main complaint on long days in the heat, the difference is real and worth paying for. The pack I’d point anyone towards who hikes regularly in warmer conditions.

The Bottom Line

The Kestrel 48 is a well-built, sensibly featured pack sized correctly for most multiday hiking situations. The AirScape panel is a reasonable trade-off for stability on technical terrain, but don’t buy it expecting a cool back. The lifetime guarantee makes Osprey the default choice for large packs at this price point, and the 48-litre volume is right for most trips without pushing you into carrying more than you need.

If you hike occasionally, save money and get the Rook or Renn. If you hike regularly in heat, look at the Atmos AG. If your trips involve flights, look at the Fairpoint or Fairview. The Kestrel is the right choice for everything in between.

Verdict: RATED

The right size, the right features, and a guarantee that means you buy it once. Just don’t expect your back to stay dry.