It's possibly container-seal design month here at Giz, but we've found a winner in the Snap Capp. It's a cheap and cheerful plastic gizmo that pops onto a standard 12- or 16-ounce drinks can, and turns it into a resealable bottle, with a lid, to stop your refreshments going flat. Simplicity itself, and it's reusable too. Available now, in a variety of colors, packs of three for around $10. [Coolest Gadgets via Oh Gizmo]