Great concept for scuba & snorkel days! I Even use it for our dogs when we camp on the beach!
I think it holds pressure for a decent amount of time so you're not constantly pumping.
I feel like the pressure could be slightly stronger than it is.
The only other thing i'd like to have is an attachment for the nozzle.. I hate having to hold it.
Moving it around, I constantly have it fall and hit the ground. If there was some way to attach it to the canister that would make this thing so much be...