Works and fits very well. I bought it for a small backpack that I use on day trips. Fits securely and is quick and easy to put on. I even use it on my 'around town' bookpack. This takes a little adjusting as a bookpack has straps that attach at the top seam and there is little "pack" to wrap the top of the cover over, but it is doable.
I ordered this only because I'm going to Freaknight this year and the venue requires clear bags only. So I found this one and ordered it on mobile so I didn't see anywhere that it had dimensions so I was half expecting it to be unreasonably tiny, but it's actually the size of a normal backpack with three pockets. I'm actually really happy with this one.
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