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Sonakshi Chaurasiya Keeps rain out effectively and the waterproof coating works great. Just make sure to measure your backpack before ordering; it fits medium bags snugly, but might be a tight stretch for very bulky travel rucksacks. Otherwise, highly satisfied!
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Murad Junjunwala I commute with my backpack every day, and this waterproof cover is an absolute lifesaver. Got caught in a torrential downpour, and everything inside stayed completely bone dry. The elastic edge grips the bag tightly, and the extra buckle strap ensures it doesn't slip off even on a two-wheeler!