Waterproof backpack cover, compatible with 35-50L, perfect for outdoor activities. - Brand: Columbia - Model: PACK COVER 35-50 - Color: Black - Size: 35-50L Thank you for viewing. I purchased this new at a Columbia store to match a 45L backpack I am selling separately. I don't think I ever walked in the rain with it, so it's probably unused, but my memory is vague, so please consider it as a used item. Also, it has been stored at home for a long time, so please understand. Thank you for your consideration. Because the first photo shows it with some thickness, I will fold it to a size that can be put in a post and package it. Please note.