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sharky nrk Perhaps you could find or make a carboard box with those dimensions to test it? Remember though, the Coocase is rounded. A square box that size would hold a little more. If it won't fit, buy the next larger Coocase. The larger ones definately aren't as cheap though. If anything, you could still wear the backpack with some of it's contents in the Coocase. At least you could reduce the fatigue.