Thomann Rain Cover E-Guitar Gig Bag

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.