This is one smart bag. Whether you&';re in the field or a safari vehicle it&';s perfect when you want to be ready to take the shot at a moment&';s notice. The 3Xpandable bag can be ingeniously folded to three different sizes - or folded flat! Position 1: full size, 27.75" height; perfect for a long lens in shooting position with teleconverter and camera body* Position 2: Folded down to 23.5"; makes the bag more compact and lowers its center of gravity Position 3: Folded down to 19.75"; now the bag is small enough to be used as an airline carry-on aboard most commercial aircraft. Removable lid with pocket zips on easily and securely at all three positions Male and female ends on removable shoulder strap allow for strap to be used to secure bag Removable reinforced insert panels allow you to configure the weight and support Soft sided construction allow the bag to be folded nearly flat for storage or packing Built to last with heavy-duty water-resistant Codura and lightweight, water-resistant nylon lining M.O.L.L.E webbing system to easily add pouches and accessories Removable harness (sold separately) Multiple connection points to secure the bag YKK zippers Expandable exterior mesh pocket Tripod/Monopod support options Lens Collar insert now included Made in the USA *Accommodates camera body with lenses such as Canon 200-400mm, Canon 300mm f/2.8, Canon 400mm DO, Canon 500mm, Nikon 200-400mm, Nikon 300 f/2.8, Nikon 500mm, Sigma 500mm, Sigma 300-800mm, Sony 500mm. Internal dimension 8"x8" (20.32cm x 20.32cm) x 19.75"or 23.5" or 27.75" (50.16cm or 59.69cm or 70.49cm) Weight 2.13 - 3.5lb (.964- 1.59kg) Folding Xpandable Long Lens Bag