Shockproof and Waterproof: made from impactresistant and compressionresistant ABS engineering plastics, this storage case is designed to withstand shocks and water exposure, making it suitable for harsh environments and outdoor activities such as camping and wilderness survival. Durable and Reliable: built with hardwaregrade stainless steel and other quality accessories for longlasting use. Includes buffer rubber antislip pads inside for secure loading and unloading. The solid opaque design blocks light penetration to protect contents. Practical and Easy to Use: compact size with sturdy construction provides ample storage space while offering easy access and straightforward operation. Multiple Sizes: Type A: small box with external dimensions of 170 x 110 x 48 mm and inner size of 150 x 80 x 40 mm. Type B: large box with external dimensions of 190 x 120 x 52 mm and inner size of 160 x 90 x 44 mm. Type C: professional waterproof box with ample internal and external volume dimensions. Use scenarios: Outdoor adventures: store tools, compasses, first aid supplies, and survival gear in a secure, protected case. Electronics and precision items: protect delicate equipment from shocks, moisture, and sunlight. Travel and field work: organize spare parts, accessories, and small components for quick access and transport.