Designed for when you need a little more; more food, and more safety gear, the Columbia Titanium Mobex XL Backpack is still lightweight, fast, and action-ready. as the original Mobex. A clamshell main zipper allows the main compartment to peal back to its base for complete visible access to everything inside. Interior contents are kept neatly in place by cargo netting dividers. Omni-Shield-armed material on the packs back deters moisture, grit, and grime.