Oh I forgot the reason I can't use the daypack that I like on the bike: it has some internal rigidity stuff that digs deep into my neck when I try to hold my head up on the bike. So yeah, not digging into your neck when you are riding is also a good feature. This green one I actually can set to dig into my neck but if I move the straps to make it less good off the bike I can get it into a zone where it is not in my way on the bike. Or, I'm not in its way, 'cause I'm the one moving, it stays put.