Kata DW-493 Comprehensive Camera Waist Pack Rain cover: The provided elements cover will protect your valuable equipment during rainy and extremely dusty conditions. Simply install over the bag like a shower cap to protect your bag and gear TST Rib: The TST Rib provides discreetly structured protection, where it counts. Located on parts of the bag that are sensitive to shock, the TST Rib will protect your gear from bumps and any unwanted shock 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