I'm sold. This pack has everything I need in a Winter day pack or light overnighter in the warm months. I pack heavy on day trips. I like to be prepared. Plus, a platypus of Merlot is a nice touch at lunch on a sunny peak.

The hydration pocket holds my 100 oz. CamelBak reservoir just fine and if I don't take that, the mesh pockets will fit a Nalgene bottle on each side.

I live in Seattle so the built in rain cover is worth the weight. The pockets on the hip belt rock! One for camera one for small binoculars or compass.

The trekking pole thing seems ridiculous -- until you use it. It looks a little funny but works very well.

I've used the big top mesh pocket to carry a snow shovel, and with a couple of straps was able to tie down my MSR snowshoes on top of that. Avalanche probe gets strapped on with the side compression straps. And there's room outside the main compartment for even more.

I keep my first aid equipment (I'm a mountaineering first aid instructor) in the bottom of the main compartment and I like the fact that I can access it easily through the lower zipper.

I haven't overnighted with the pack yet but I've packed it up to see that everything fits. I'm sure I could do a Spartan over-night with this pack.

As far as comfort goes, everyone is different. This pack works for me better than the half dozen or so I've used in this size range. I would buy this pack again in an instant! Osprey makes a quality product. I have the Argon 70 as well.

works great used it on a ten day moose hunting trip in nothern Alberta this fall

Originally, I purchased the Osprey Stratos,32 which is a very good pack. The AirCore Suspension really does what it's designed to do: ventilate and keep you cool. However, the necessary curve required for the AirCore Suspension limits easy access to the bottom portion of the pack's main compartment. And as someone else has already mentioned, if you also use your pack for school or work in addition to hiking, it is difficult to carry a notebook computer. I returned the pack and replaced it with the Osprey Kestrel 28. I purchased two: one for my wife, who describes the lichen color as very fashionable, and one for me, who prefers the twilight. One other item: The Stratos has "O" rings on the zipper pulls; the Kestrel has a more simple pull. I prefer the "O" rings so I purchased a dozen from Osprey ($0.50 each) and replaced the pulls on both of our Kestrels. Nice.

I've had the Kestrel 28, for 9 months or so and have used it quite a bit for for weekend trips and some technical scrambling. My only complaint is that when the pack is only partially loaded the back panel will sometimes form a roll creating a nasty pressure point on my back. It potentially could be fixed by inserting a longitudinally stiff plastic sheet behind the existing back panel. Other than the pack being uncomfortable at times I think its great.

We've owned our Osprey Kestrel 28 daypacks for a few months now. After many day hikes, I believe this is the best day pack I have owned. I'm no expert, but I've been using day packs for 25+ years, so I do have some experience with them. My wife thinks the pack has too many features, which I think she finds a bit overwhelming. I say if you don't need the features, they're there should you ever change your mind. The plethora of features don't add significantly to the weight, so all is good. The Airscape back panel is very good, though it is not as efficient (that is, cool) as the Osprey Stratos AirCore suspension. The integrated rain cover is a plus as are the hip belt pockets. The stretch woven side pockets are adequate; however, they really need to be deeper to more securely hold longer bottles. One feature that I didn't like (before using it) was the Stow-On-The-Go trekking pole attachment. This feature has proved to be one of my favorites. I use trekking poles. There are those times when hiking on treacherous areas of the trail or going over rocks and boulders that trekking poles get in the way. I have used the Stow-On-The-Go feature to hold the trekking poles and keep them out of the way while I maneuver through rough areas where the trail is too narrow or so overgrown with brush that using trekking poles becomes impractical. The hip belt and shoulder straps are easy to adjust and comfortable. For winter use, I can easily strap snowshoes on the back of the pack with belts I purchased from REI. The zippered top pockets are convenient for car keys, wallet, Clif bars and other items that you may want to access quickly. I didn't like the zipper pulls, so I purchased the O ring zipper pulls from Osprey and swapped them out.

I bought this pack because my other daypack was not long enough to use the waist belt to distribute the weight to my hips. This pack has a torso adjustment that allows you to customize the fit. The 28 does not have any type of internal frame, but it is not needed with light loads. The water bottle holders on the sides are not quite deep enough for large bottles, but it is hydration compatible. It will carry skis (A-Frame) with no problem.

Like most Osprey's, the fit is great. It's a very comfortable pack to wear although I haven't really put it through any really rigorous testing yet. The little straps for hiking poles which I originally thought I was going to just cut off actually work really well. It's got a ton of space. There is however one thing that I don't like: the butterfly coils on the back are lined with velcro - the reason for this is because the loops used to affix hiking poles, ice axes, etc are attached to the bag with velcro. So really...the ONLY thing that you can put in those butterfly straps are the doo-dads that come with the pack. That's only very slightly annoying. I've yet to test the pack with ice axes....but it holds on tight to trekking poles. Well worth the price.

I dig it. Has plenty of room for even a several day outing, although I'm a bit of a minimalist. The hip pockets are really convenient, but they could have put them more forward. Be warned: if you someone who loves padding the shoulder straps and hip belt is pretty thin. Not mentioned above is that it indeed does have a small mesh pocket under the lid.
Also if you are using a 3 liter size Camelbak the holder for this expands into the main storage area, so that much water takes up a bit of space.