LIGHTWEIGHT – made of durable non-woven fabric with an insulated liner and reinforced carry straps to provide plenty of room without adding extra weight. Side gussets expand to allow the zipper top to close when packed full; gussets fold in and tuck under the zipper when not full to allow for compact storage. REUSABLE & ECO-FRIENDLY – Forget wasteful plastic or paper bags! Use your favorite ice pack (loose ice is not recommended) and take it with you to the office, grocery store, picnics, concerts, wine and cheese parties, camping, etc. Also makes a great mini diaper bag for moms or dads