Holland's Field Bag Medium. Holland Field Bags are made from heavy Cordura material and snap easily to your belt for quick removal in the field. The 3-way height adjustment allows you to quickly and easily support the rifle butt when shooting from a bipod in the field. Don't go hunting without one. Now available in 3 sizes to suit shooter needs. I've used the smaller bag all over the world with GREAT results. Used mainly in the prone position to support the butt stock and provide a solid rest. I never go on a hunt without one. Choose the size that best fits your body size and type. 5" x 3" x 4"