The dual zippers on my backpack, if zippered to center, occasionally slide open, and, because they zip all the way to each side (zippers are an upside-down U shape) the whole thing slides completely open possibly dumping contents while I walk around completely unaware.
Add a vertical (perpendicular to the zipper) center strap with clasp to avoid this problem. Perhaps you only use it when carrying something really important; otherwise, it gets in the way.
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