The trifecta 10 by think tank is designed to give you quick access to your ultra wide midrange and telephoto zoom lenses with three points of access this slim backpack allows you to access your equipment without having to take it off and has adjustable dividers that can convert it from right handed to left handed use a separate top compartment can be used to hold your personal belongings and there is an additional tablet pocket stretchable front pocket and internal organiser the exteri