Review on Convenient Beverage-Integrated Luggage: The Ultimate Backpack Suitcase with Handles by Kim Savage

I'm a flight attendant and I agree! I saw a passenger coming with it the other day and ordered it on the spot. It fits in the water bottle that my airline carries, as well as my cup of tea or drink that I usually take with me on morning flights. On the back you can stash a passport or a thin wallet or something for quick access. For added security there is a strap you can attach to the bottle or mug to ensure they stay inside. Highly recommended for travellers.