The genius of this product is that it sticks to itself. You just roll it around the boxes or posters or lumber that you want to wrap and it sticks tight. I use it for a bunch of things, as in the garden to stake trees to stakes or to tie say tomato plants to a frame, or as shown in the photo, to keep some nuts together with ball bearings (and have them be visible). It’s the same material they use to wrap boxes of books on pallets so that they’re one tight bundle for shipping. Also cool is that it is such a strong yet ultra-thin plastic membrane, not using a ton of resources to produce. They sell them at U-Haul stations. They’re cheap!
Above is a pic of stretch wrap I bought at a U-Haul location. At left is a tube of skateboard ball bearings, with some loose nuts wrapped to the tube. Not only attaches them, but keeps them visible.