I wanted a light weight back pack and settled on the Mountainsmith Scream 55 and I was pleasantly surprised. The pack is very lightweight and has a lot of space.
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.
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