Steve Bankswrote a review of Mammut Trion Light 28 Backpack - 1708cu in on April 9, 2017
Familiarity: I've put it through the wringer
Removable top lid, rope strap, just the right amount of space and super comfortable.
I like how you can take the lid off or just make the straps longer for a bigger load. Even in the 28 L I can make it work for fast n light overnight alpine trips. Stripped down this is an awesome day pack and can carry plenty of gear to the base of the route, drop the lid and waist belt and it climbs nicely as well.