Life is more exciting when the only constant is change. The Eagle Creek Switchback 22 Carry On Bag lets you change up your luggage, depending on your travel needs or the planetary alignment. It is a versatile combination of carry on bag with zip off backpack, giving you enough packing space for a long weekend without requiring you to check a bag. The removable straps and hipbelt transfer between the main bag and backpack, making sure the weight from the bag is on your back is properly distributed. The main bag conforms to U. S. airlines' standards for carry on luggage, sporting an airline friendly profile of 14x22x9 inches. How you get the bag on board is up to you carry on your back with the removable Back to Back Straps, or roll it down the jetway on ultra rugged wheels with the traveler tested handle system. Have no fear if you're careening off centuries old brick walls, dodging taxi drivers and oblivious tourists the Bi Tech and Bi Tech Armor fabrics resist scratches and scrapes, not to mention pigeon poop and dust disturbing drizzle. The zip off backpack readily stows under the seat in front of you, leaving the aisle clear for takeoff and landing. When you're not a plane, the backpack is more flexible than a gymnast. You can strap it to the front of the main bag, you can wear it on your back, or you can slide it onto the main bag's handle. In any position, the backpack can accommodate both a 15in laptop and most tablets, as it contains separate sleeves for each. The final horn worth tooting about the zip off backpack is the key fob with Porter Key bottle opener. Keeping your house keys handy is nice, but indulging in a cold beverage after 36 hours of traveling is heaven on earth.