Why does our backpack cover have a buckle strap that clips under the shoulder straps? - The differences from other cover.
If your backpack has shoulder straps that meet the main pack right at the top seam, then the elastic of most rain covers will not be able to keep the top edge near the shoulder straps dry, so we added a buckle strap that clips under the shoulder straps, the edge of the cover will be snugly attached to the shoulder straps and no water could get into your backpack.
Once the cover clips on your backpack, roll it down if you want your backpack to be covered in a sudden rain, roll it up if you want to take something out of your backpack, there is no need to release the buckle and take the cover off your backpack, just so simple and easy to use.
This is the difference from other bulky multipe buckle strap rain covers and thats why our backpack cover is so outstanding.