Adam Lwrote a review of Osprey Packs Mutant 38L Backpack on May 5, 2016
Familiarity: I've put it through the wringer
I have become a cheerleader for Osprey and I'm slightly impartial. Their packs are always feature rich, comfortable, and protected by the best warranty in the business. I own three packs from Osprey (including this one) and I've had to use the warranty twice. It is true what they say; it will get fixed for free (even if your dog chews on it like mine).
I bought this pack for multi-pitch and alpine climbing for its removable frame, compression straps, and features (like the awesome helmet holder). I love it so much that it is now my day-pack for hiking and may even get used for ultralight overnight trips. Highly recommended!