Lowepro Pro Roller x200 AW Digital SLR Camera Bag/Backpack Case with Wheels (Black),One Size Removable Reserve Pack unzips from hard-shell exterior, which has another zippered front flap, creating two separate cases MaxFit divider system has thinner, yet stronger touch-fastened dividers, which can be inserted after you settle your gear to maximize the interior space Durable urethane-cast wheels glide smoothly, are vibration resistant, and feature ABEC-5 rated bearings Built-in all weather AW cover protects the entire Pro Roller from rain and dust TSA-approved lock is built into the pack to lock zippers