• The master box includes 4, 10 or 15 insulated containers.

• This insulated container fits as an insert into USPS Medium Priority Flat Rate Box.

• Fits perfect! Great for keeping things warm or cold. This only includes the styrofoam box and not the cardboard box provided by the US Post Office.

• Perishables and other temperature sensitive items (such as chocolates, cakes, burgers, sausages, flowers, or medications) can be mailed at a flat rate in a temperature controlled environment.

• The Styrofoam is made of Expanded Polystyrene Foam (EPS).

• Features:
  • Temperature Sensitive.
  • Waterproof / Leakproof.
  • Locking Lids.

• Dimensions:
  • Outside Dimensions: 11 x 8 1/2 x 5 in
  • Inside Dimensions: 9 1/2 x 7 x 3 3/8 in
  • Wall Thickness: 3/4" in