Doesn't stay on a standard-sized backpack.

I bought this cover to shield my bag when biking in the rain (10 minute bike ride), but I don't use it at all anymore. It managed to stay on for my first two bike rides, and on my third, it slipped off as I was walking out of my building (before even getting to my bike). It's very easy for this cover to slide off from the top of your standard backpack when you're wearing it. If your backpack's shoulder straps attach directly to the top of your backpack (like many backpacks), this cover won't stay on, it'll simply slide off. Also the elasticity wears off after a few uses and it barely manages to stay on after that. If you really want to buy this, you should also buy some sort of strap in order to hold together the vertical length of your backpack to prevent the top and bottom from slipping.

###

