Kata KT DT-211 Digital Torso-Pack Rain cover - The provided elements cover will protect your valuable equipment during rainy and extremely dusty conditions. TST Rib - The TST Rib provides discreetly structured protection, where it counts. On Board - This bag complies with most airline regulations for carry-on luggage. Shoulder Strap  Ergonomic, so it fits your exact shoulder grade for optimal carrying angle. EPH System Compatible - This bag is compatible with the Kata EPH system which will allow you to connect additional bags.