100% PC : A combination of strong, lightweight ,shock absorbent PC for ultimate protection. Lightweight Trolley Sysytem: Strong, lightweight aluminium tubes help reduce weight and improve strength. Combination TSA Lock: Recessed combination Lock provides security and is TSA Compatible. Space Expansion from the middle: This provides up to 25% extra space while ensuring stabiltiy in Medium and Large size Padded Laptop section: Cabin bag has padded laptop section with organizer in the front.