TRY Fold 50lb Airline Approved Shipping Box. The TRY Fold 50 lb. box will protect your fresh or frozen perishables for safe transport. The box is designed with a durable doublewall corrugated outer box with a 3/16in foil/bubble liner that is glued inside the box. The liner comes with double-sided tape to allow you to close the liner once filled with your product. You can ship both frozen and fresh perishable products in the TRY Fold 50 lb. box. The most successful method is shipping vacuum-packed frozen products. This method requires no gel or dry ice as long as you pack the box full of your product. If you have extra space, fill it with extra dunnage to top off the pack, so you eliminate as much air space as possible. You can expect 18 - 24 hours of shipping time to maintain the frozen product. If you are shipping fresh products, you will need to use a refrigerant such as gel or dry ice.