this cover have open back, probably so that guitar can be carried on the back with gigbag straps. but on the other hand, that way guitar can not be 100% protected from heavy rain.
I did mistake by buying this cover because I didn't read reviews, and from product pictures it is not possible to figure out it has open back. in fact I was looking for cheap dust/moisture full size cover for one of my guitars which I'm not using very often.
this cover can't fit on bigger or thick padded gigbags like Thomann E-guitar Gigbag Premium which I have.
material itself seems of good quality for rain protection, although whole product is not useful for my needs.