I feel the bag has not designed for fast-moving activities, unless carry certain heavy gears. For example, if riding mountain bike, the bag may bump out of your shoulder; if you tight the strip, you may feel a little uncomfortable for the shoulder, especially, for the whole body' balance.
It is nice bag for jogging, walking, schooling and requiring less body balance.
Cons: not for serious performance
This review was written in the old system and had content requirements that are different than reviews written today.