★ This is a rain cover that came with the purchase of a Columbia Castle Rock (rucksack) 20L. I decided to list it because I don't think I'll use it. If you're looking for one, how about it? ★ Never used. Currently stored in a bag. ★ Although it is a new, unused item, it has been stored at home. Please refrain from purchasing if you are nervous about this. ★ Feel free to ask any questions!