The top and sides can be rolled up, creating large mesh openings. It's very easy to regulate the temperature, and I found it helpful for keeping an eye on my dog. The bottom board cover is also washable. I'm selling it because I have too many bags. Please check the photos for the condition. Used item. Will be shipped compactly. - Color: Black - Design: Backpack style - Number of pockets: Front, side pockets - Closure: Zipper - Material: Nylon Thank you for looking.