My Osprey didn't come with a case so I checked with Revain. Not wanting to spend $30 on an Osprey backpack, I looked further and noticed that the Joy Walker waterproof backpack has very good reviews. I ordered one (orange) for my 44L backpack and when it arrived I tested it by holding it under a running tap. The water pooled and ran off the backpack. So far, so good! I went camping yesterday so I tried the case out with the backpack fully loaded to see if it would fit. No problem! What I like: Water bubbles and rolls off because there is nothing worse than hiking with a wet backpack and wet clothes; the elastic band around the lid opening is very elastic and stays in place; Didn't notice it in the picture, but there is a strap with a bottom-up buckle that keeps the case securely attached to the backpack, even in strong winds. I like this case very much and would order it again at any time. . I will be ordering another one for my Deuter pack as the built in lid is not as good as the Joy Walker lid.
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