All Aluminum Construction, Aluminum-magnesium alloy bumper corners for enhanced overall durability. Minimalist Design with spacious interior. Double sided packing and removeable pockets for optimal organization. TSA Approved Locks - Suitcase uses zipper-less design to facilitate travel and business trips. It's equipped withTSA-approved Metal locks to quickly pass customs inspection. Silent 360 Degree Spinner Wheels Dimensions 20" (21"x15"x9") 26" (28"x18"x10") 28" (30"x20"x11") 20" (21"x15"x9") Weight : 9 Lbs Capacity : 9 gal 26" (28"x18"x10") Weight : 11 Lbs Capaciy : 18 gal 28" (30"x20"x11") Weight : 13.8 Lbs Capacity : 21 gal