The strap (and buckle) is too thin and it gets uncomfortable when fully loaded. Curved bottles are not practical, I changed them to 0.5 L bottles. Side pockets sit in the back (not at the sides) and are not easily accessible. side pockets are bigger than expected, I put a lot of stuff in there: mobile, wallet, foldable water bowl, map, etc. the main compartment is roomie. I use it for trail running and day hikes. The thin strap makes it uncomfortable for long hikes (or runs) but good for biking.
Palo Alto, CA