I bought the medium, but exchanged it for a small since I travel with minimal "stuff". The med took up almost half the room in my carry on. It's a bit larger than when you measure it out on paper, fortunately for me they have different sizes. It is well made with sturdy pockets and zippers. I'll be on a two week trip and probably fight for counter space with the hubby, so I think this will solve any unforeseen problems!
I bought the small organizer for my 6-year old to use after swim practice. It holds her full-sized swim shampoo, conditioner, shower gel, comb, detangler, hair accessories, and lotion perfectly. The hook is perfect for hanging the kit in the hook outside the shower stall and leaves my hands free to rinse out gear or help her as needed. Fabulous product!