Kata KT PL-A-18 Pro-Light Access-18 Holster Elements Cover: The provided elements cover will protect your valuable equipment during extreme weather conditions. Simply install over the bag on the black side for rain protection, the silver side for heat deflection, or use as a dust cover On Board: This bag complies with most airline regulations for carry-on luggage. Due to ever changing carry-on requirements please check with your airline carrier prior to departure Aeriform Foam: Perforated super light laminated and reinforced EVA and EPE foams Spine Guard: Specially formed foam encased spring steel spine for ultimate structural protection