Great for a day hike or on a bike tour through wine country, the Columbia Girl's Titanium Mobex Sprint Backpack is Built for all outdoor activities. The Flex Frame feature is a network of flexible poles that provide featherweight structure and spring back to life when crushed. The clamshell main zipper allows the main compartment to peal back to its base for complete visible access to everything inside. However, nothing will come tumbling out, because interior contents are kept neatly in place by cargo netting dividers. Omni-Shield technology on the back of the Mobex Sprint deters moisture, grit, and grime.