The Think Tank Retrospective 50 Shoulder Bag (Blue Slate) is comprised of four shoulder bags and two lens changer bags. Created for the professional photographer that wants to blend in with the crowd and remain inconspicuous in any situation. The product designers have blended the look and feel of "old-school" camera bags with "new-school" features and technology for the digital imaging age. The Retrospective 50 has sufficient height to accommodate a 70-200 attached to a pro DSLR bodies in a vertical configuration. The "sound silencers" underneath the main flap are used to suppress the loud tearing sound hook-and-loop makes while opening and closing the bag. Simply release the sound silencer panels and cover the hook-and-loop strips to prevent the hook-and-loop from contacting.A clear business card pocket, for identification and spare cards, is also located under the main flap. A fully adjustable, canvas strap is integrated into each Retrospective bag. For extra comfort, a breathable cushioned pad slides along the strap for optimum positioning. Sections of non-slip material on the pad helps keep the entire strap on your shoulder. The seam-sealed rain cover included with the Retrospective series was specially designed to keep the carrying handle and integrated shoulder strap outside the rain cover without compromising protection from the elements.