Bests & Worsts Reviews from Amazon

This cover fits my REI Trail 25 pretty well. It keeps the pack dry and mostly stays on. The elastic feels very durable. The missing feature is that there needs be a clip/carabiner/strap in order to attach the cover to the pack. As you can see in the photos, when the pack is not being worn, the cover fits securely on. However, when the pack is worn, the straps of the pack push the cover off the lip of my (and I surmise most) packs. My solution: use a binder clip at the top. Not elegant, but sufficient thus far. I would give this product five stars if I had confidence it would never fall off on its own.