Thank you for viewing. I am selling this item because I haven't used it recently. As shown in the photos, there is a feeling of use. I think of it as part of the product's character, so I hope someone who appreciates that will purchase it. Here is the product description: A striking cooler bag made of Tyvek. The lining is sewn with an insulation sheet. It's sized to fit a 500ml PET bottle, but it can also hold a mess tin or a Sierra cup. Also, it's the perfect size to store a KOVEA CUBE, so it can be used as a storage bag. As you know, Tyvek is a very strong material, and its texture improves with use, making it a bag that's enjoyable to use. This is a simple cooler bag and does not have refrigeration capabilities. Also, because the insulation material and Tyvek are sewn together, the shape and size accuracy will vary for each bag.