I discovered these packing squares this summer while already on vacation. I stumbled upon them and thought it was a really neat concept and bought one pack. I now own three sets. They pretty durable, with a mesh front so you can very easily see what's inside. I have been on two trips since getting them and really cannot imagine packing without them. A few ideas of what I use them for: the small one I use for all my chargers and cords, medium I made a little first aid kit and the largest one, I put a book and a few small travel games. The uses are endless.