The Airport Commuter Backpack from Think Tank is larger than Think Tank's Airport Essentials Backpack and is sized to hold a pro size DSLR, 4-6 standard zooms, your iPad and 15" laptop. The extra space this bag provides allows you to take along your 400mm f/2.8 attached to the camera body or your 500mm f/4 unattached. Your gear is nested within the supplied padded dividers in any configuration you choose while your computers are tucked safely away in their own separate, zippered lockable compartment.Overall, the pack is designed for maximum efficiency and portability and meets the needs of the pro shooter who needs a quick access pack that both travels well and is secure. The exterior is made from a combination of ballistic nylon and polyurethane for strength and water-resistance while the inside is nylon with padded closed cell foam dividers. For security, the pack comes with a security cable and lock that can be tied to any solid object such as a reception hall column or fence. This allows you to remove gear knowing that the rest of the pack will remain where you leave it. The strong YKK zippers on the pack can also be locked with user-supplied locks for even more peace of mind.As part of Think Tank's Airport series, the Airport Commuter makes your traveling life easy and comfortable. There are carry handles on three sides and the adjustable harness comes with beefed up lumbar support and Air Mesh paneling to keep your back cool while on the march. For sheer convenience, the adjustable shoulder straps even have elastic pockets for your iPhone or business cards. The waist belt is removable and can accept Think Tank's optional Pro Speed Belt or Thin Skin Belt that will make portability more comfortable as well as increase your load capacity. Inside, the main flap has see-through laminated mesh pockets for storing everything from memory cards to snacks.