From website - Our expandable under-seat carry-on is an extremely versatile bag that starts off as a small easy-to-store pouch, and opens to become a 4-wheeled carry-on that slides comfortably under the airplane seat in front of you. Need more space? No problem! Your under-seater expands a full 5 upwards, to become a full sized TSA approved carry-on!

Specifications
Dims: 16 x15 x9 , Expands to 21 x15 x9
Dims Folded: 15 x9 x4
Weight: 3.85 lbs
Volume: 30 liters not expanded, 42 liters expanded.
Materials: Exterior fabric: Crinkle Nylon, water and tear resistant
Zippers: Nylon
Care Instructions: Wipe clean with damp cloth.

Product Information