The inflatable tote bags by Juicy Couture are sold out at Nordstrom, but look to be on sale at Saks (or google to find other places to order, if you're interested) what a great idea!
Bubble Furniture had some inflatable sports bags and backpacks, but they seem to be sold out now. Try here.
Found this one while cruising the internet, but could not find manufacturer info
I figure it still might spark your imagination on crafting with vinyl, or bubblewrap, or something...