SKB Mil-Standard cases were designed to meet the most demanding military specifications. They are roto-molded for strength and durability, airtight and water proof with solid stainless steel latches and hinges that will withstand the most demanding shipping conditions. The 3R Mil-Std. Cases are molded of (LLDPE) polyethylene impact resistant / UV stabilized material and meet or exceed MIL-STD 810 and MIL-C-4150J SPECIFICATIONS• Waterproof and dust tight design (MIL-C-4150J) • LLDPE Polyethylene impact resistant • UV, solvents, corrosion, fungus resistant (MIL-STD-810F) • Pressure relief / breather valves • Resistant to impact damage (MIL-STD-810F) \n• NO FOAM, WITH WHEELS WEIGHT • Shipping Weight 31 lb INSIDE DIMENSIONS •Lid Depth 3.0000 in •Base Depth 9.0000 in •Interior Length 44.25 in •Interior Width 17.5 in •Interior Depth 8in CERTIFICATIONS • MIL-STD-810F • MIL-STD-C-4150J