Details: - Size: 11.5" x 11.5" x 5" - Material: Soft durable polyester and aluminum foil - Function: Keeps your food warm or cold for up to 5 hours - Design: Zipper closure keep it easy carry and securely, convenient to storage bento box, fruits or drinks - Usage: Ideal for everyday use,office,school,beach,travel,picnic or camping, suitable for both adults and kids - If you have any question please contact us,we are glad to serve you! Wish you a happy shopping!