20L backpack
All the safety pockets and zips are as advertised. The shoulder straps have front facing tightening straps that help the fit The shoulder straps have D- rings for attaching small bags. The water bottle holder uses a snap to create a smaller bottle holder. With the pack filled a 12 oz bottle, 2 5/8” just fits and unsnaps too easily. Un-snapped it holds a 24 oz bottle very loosely. The depth could be an inch deeper. Will see how it all works on an upcoming 12 day trip. It really is a good size. I have a 25 L photo backpack and that is too big for a day pack, as I’d just fill it and be miserable.