Enjoy 3zip -

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Because the pack is made of three distinct panels, it can flex and expand more naturally than a single-panel pack, often allowing you to over-stuff it more effectively. ENJOY 3zip

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Dana Gleason Interview :: The Invention of the 3Zip (Part 2) ENJOY 3zip

The design allows for a "rip-open" motion. By grabbing the top handle and pulling, you can instantly clear the top zippers for fast access to the main compartment.