The old 25/30L Waterproof Totes have two connect buckles on the interior. There is no way to use these for any of the pockets (say I’m just using it open and not with the top rolled) because they are the same type buckles as the Packing Pocket 2L Ultra exterior clips. If you made an adapter (buckle to buckle), it would be endlessly useful to just connect the buckles to accessories like the Pocket 2L.