Inside size: 170 x 70 x 75mm; External size: 200 x 98 x 82mm; Great for outdoor use; Easy to operate; Made of shockproof ABS engineering plastic and stainless steel; With buffer rubber anti-slip pad, can be removed as your wish; Specially designed for protecting equipment, waterproof and dust-proof; Auto pressure mini valve design, easy to open when suffering from large temperature difference or strong altitude pressure change