This box-bottom bag is designed to give the user a choice of whether to drape it over the bars of the walker/rollator or take it off and use the whole thing as a shoulder bag/purse or take it apart and use one side to make a shoulder bag. The zipper pocket on each side provides safe storage of phone, wallet, etc. and there are also open pockets with Velcro closures on each side for water bottle, lists, etc. The zipper ends snap together to keep them out of the way and out of sight. The strap is removable and snaps easily back on.