Kata Pro Light KT PL-LT-314 Torso Pack 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 Modi-Vers Compatible: This bag is customizable through the use of the modi-vers divider system. This allows you to protect your equipment while creating custom compartments to fit your unique equipment. You can cut custom dividers to fit whatever size you need to keep your equipment snug EPH System Compatible: This bag is compatible with the Kata EPH system which will allow you to connect additional bags for extra carrying possibilities. You can add backpacks, torso packs or waist packs to any one of your Kata EPH system compatible bags Aeriform Foam: Perforated super light laminated and reinforced EVA and EPE foams