Packing light is the answer to lower baggage fees and these bags help you keep light and organized in the limited space of a carry-on bag. I bought one set of these bags to try them out. I find the smallest bag the perfect size for all those cables, charges, batteries and other electric gadgets and accessories. The middle-size bag easily handles bras, panties and socks while the large bag holds three rolled t-shirts, pajamas and a travel towel or two. I'm buying a second set and watching for sales to pick up a few more for presents!