I'm way to work today I got a flat. Good tire, good tube, and tube liner. Either way a very small nail and a industrial staple took me down at the same time. Got someone to pick me up and get me to work. While on the clock, I took apart my rear wheel and patched my tube for two holes. I didn't wanna get a flat again so I began to think of stuff that will make a good tube liner.... I though layered duck tape sounded like a good idea but then a I saw an old tire strap from one of my jobs car trailers. Its about 2mm thick and very hard to stick a knife trough... Got a long enough piece, fit it in my tire, and aired it up. Hopefully no more flats, at least in the rear wheel.