Plano Element-Proof Field Ammo Medium Box - Olive DrabElement Proof Field Ammo Medium Box Olive Drab A very Handy Ammo or Accessories case with the benefit of being fully waterproof. The full length o ring seal keeps the box airtight to prevent dust and other fine unwelcome objects from entering. This mid sized storage box is ideal for . 50 cal ammo storage, but the element proof medium field ammo box can hold so much more than that! The water resistant O ring seal and brass bailed latch secure contents