Our watertight bags are made with a unique square bottom design to safely transport fish and other marine life. The 3GSBW1 bag measures 6" x 4" x 18" and is double-sealed for extra strength. This bag is ideal for shipping, transporting or displaying fish at auction. Other uses include any application that requires watertight packaging. The sides expand to form a square bottom, allowing your fish to swim freely without getting caught in any corners. These tropical fish bags are made with metallocene material to prevent leaking or splitting during transporting. Keep your fish safe and happy in this reliable, watertight packaging.