I use ziplock freezer bags. I put a 3x5 card with all the load data on it in the bag with the ammo. Was at the range yesterday with a dozen loads to test. I was going to make some notes on the cards about how it shot, but didn't. Wrote on the targets instead.Typically if I'm working up several different loads with different powders, bullets, etc I just use the quart size Ziploc bags that have a white area to write on. Sharpie marker, toss the bags with loads I didn't like.