Thermo Chill Nestable Insulated Shippers are engineered especially for stackability, excellent drop shock and improved internal product cooling. Ideal for 1- 6 day transit time. They are lightweight, very durable and very cost effective. The nestable design saves space, doubles the quantity per truck and doubles the quantity in the same allotted warehouse space. It's a terrific benefit to your bottom line and storage concerns. For extended shipping time, use convenient ICE-BRIX new long size refrigerants or standard sizes to surround the product and across the top to maximize the shipping time. Delicate enough for tropical fish, live coral and strong enough for heavy 5 gallon plastic buckets of foods and liquids to ship safely.