Must-have travel gear - inexpensive zipper bags

Ever since I started using these nylon mesh zipper bags, my travel experience has improved. I have one bag for paper stuff and pens, one for medicine and first aid, one for tools and gear, one for cords and portable power, and one for snacks. When I get home I leave the bags in my suitcase, making packing much easier the next time I take a trip. The bags are see-through and very durable.
I just bought another set of these bags to hold components for Raspberry Pi projects. I think I have a total of 36 of these bags now.