I purchased this two years ago, but I've only used it a few times and won't be using it anymore, so I'm putting it up for sale. It's a model from two years ago, but it hasn't been used much and is in good condition. It's the type that you put a frozen plastic bottle in. - Brand: YAMAZEN DIRECT COOL - Accessories: USB cable - Design: Backpack-type cooling vest - Features: With cooling function Thank you for looking.