You can often just stretch and restitch the rubber bands. Use a good carpet thread. I made some new straps from some lengths of rubber cut from a tyre inner tube. 2 strips per pocket. The attachment rivets can usually be reused. When the elastic gives way, the stitching weakens the rubber, fix them ASAP before the vinyl starts to split and crack. Old damaged cards will often have decent pockets for re use as long as you have the right colour. Don't use the pockets for bottles or similar. Small items and cloths only.