DRINK&BUDDY:A Bottle for You and Your Pet

Ever wondered about sharing a drink with your best bud when you go out on trips? Something that you can carry that will serve you both without lugging the extra weight and taking up more space?

Kickstarter Project here - FAQ - Updates - Comments

Seriously though, why hasnt anyone thought of this before?

I've seen the foldable ones where it rolls out to become a bowl, but I havent seen a hybrid product that doesnt waste space or water. If you're worried about back flow from their side to yours, they got that part figured out. Perhaps in the next run, they'll come out with a keg sized shareable for longer trips or multiple consumers.