Okay, this may seem a pretty a pretty ridiculous idea/question.... I have in my head
an image of a floating canbuoy, similar to a lifeguards ankle towed buoy, made of ultralight materials (carbon kevlar/GRP) which can be towed via a line similar to a lifeguards buoy. This can would be divided into two pieces with a seal and closing mechanism. Attached to the inside of one half would be a backpack and the second half would be stackable with the first half so you could have the whole unit comfortably fit on your back. The purpose of which would be (for james bond stylee coolness) to be capable of pulling on your speedos and goggles and diving
over the side to swim to shore with your portable drybox attached to your ankle so that when you reach the shore you can strut up the beach, pull out your microfleece towel, bermuda
shorts, hawaiian shirt, sun hat and sandals and a minute later strolll off into town or wherever.... I like the idea of a lightweight ankle towed tender
so you don't have to flap about with the tender
and in particular, you can put your tender on your back... depending on it's size it could hold quite a bit of lightweight kit... weight would be the main concern but i have to imagine some of those wooden surfers longboards weigh quite a bit and could be attached to the ankle... the main concern with the can would be hydrodynamics but that would be easily solvable... anybody know if this style of thing exists?