Sack-Ups Trap Plain Grey Barrels Sock up to 36 Inch 511 is a great solution for easy transport of your firearms. This Gun Case manufactured by the expert product specialists at SackUp is made with a naturally moisture wicking cotton material that is constantly moving wetness away from your firearm. The Sack Ups Plain Gray Trap Barrel Case is environmentally safe and protects against rust, corrosion, dirt and scratches that can ruin your valuable gear. This Sackups Gun Case is a great way to take your rifle with you without worrying about damaging any equipment.