TRINKA 20-30L Waterproof Backpack Rain Cover With Reflective Strip for Night Outdoor Hiking Traveling Cycling Running

Runs on the small size and anything bigger than 21L will be a struggle to keep dry* I have a 21L GORUCK GR1 bag and this cover barely covers my pack* The elastic around the edges are nice and have lots of give an stay springy when off and on your bag* reflective strip is nice and highly reflective* I do still keep this in the bottom of my bag for those rainy days but would not recommend anything bigger than a 21L bag

The cover itself is designed well, the only problem i see is that it does not hold fast on the top of the backpack. i think if i stuff the backpack to capacity it will hold, but i might not have that much stuff all the time.other than that it is a great product and i really like the quality.