Only after several double-takes did we accept this was really an inflatable kayak. The AdvancedFrame Convertible Kayak by Advanced Elements is fifteen feet long and can be converted from a single to a tandem. Admittedly, it does require an accessory to do it, but with the optional decks, it just takes a few seconds to do the conversion. The bow and stern are rigid, so you’ll still glide through the water, but the multi-chamber body is inflatable, so you’ll be able to collapse and easily transport it. Pretty amazing for something that fits in a duffel bag.