I've got a stash of 1.5mm plastic sheets (all 3x5) in storage at my folks. I was thinking, if there is a very robust sandpaper of appropriate grit I could glue to that, to make very thin, fairly stiff sharpening sheet.

But I don't even know where to start looking for this type of sand "paper". I want it to be something I can have both for BoB and EDC, so I'll want it to be durable. Even if it something like diamond or corubunum (sp) on a poly film. I'm thinking around a 600 grit for most things, 800 for touchups, and maybe 400 for stuff that is really beat or don't need a great edge like trowels.

Or has Raven flipped his lid?