The PCS145 carries one SLR and up to 4 lenses and accessories and conveniently opens from the top or the side. It features expandable outer side pockets, interior and exterior mesh pockets and elastic shock cord for carrying a tripod. The removable, adjustable padded shoulder strap with rotating-head monster hooks attaches to anti-twist double D rings. Adjustable padded backpack straps touch away. The PCS145 meets all FAA carry-on requirements and fits into the Pelican 1450 hard case.Interior Dimensions: 12 x 9 x 5.5"Exterior Dimensions: 14 (expands to 21.5) x 10 x 5.75"