Sometimes the smallest luggage is the best! You'll find cool, economical carry-on luggage here in a wide variety of colors and sizes. For short trips or long, cases designated as carry on luggage are designed to meet the strict limitations of airplane cabins, all of which are intended to be carried onto an airplane and measure small enough to fit under the seat or in the overhead bin.  ShopBags has identified 22" x 14" x 9" or 45" total (height + width + length) as a basic measurement for consumers to follow for boarding bag capacity. This is the place where you keep whatever you might need immediately. That means tickets, passport or other identification, business papers, medications, spare glasses, an extra shirt and set of underwear--just in case.