Any cool ideas for making use of one of these, besides storing a canteen? Carrying water isn't an issue and it's going to be accompanying a SAW/GP pouch and an IFAK/admin pouch

Besides a canteen, what else would be cool to store in one of these when water's not an issue? It'd be accompanying a SAW/general purpose pouch and an admin/IFAK pouch on a USMC sub belt