Great value: quality construction, flexible configuration, good price - The Outdoor Connection 3 Piece Canvas/Leather Bench Rest Bags

Canvas material is thick, well constructed, and a relatively good design. Depending on your stock, you can swap the front and rear bags to get the proper height. Easy to fill using a funnel, and the fill hole easily tucks into a pocket on the base of each piece for a secure fit. I used silica crystal cat litter which does not clump and is almost dust-free. 1 bag of this litter for less than $5 fills all 3 rest bags: http://goo.gl/wJiJ5d -- it's lighter than sand, yet dense and heavy enough to maintain position. Total weight of all 3 rest bags filled with silica crystal cat litter is less than 4 1/2 lbs.

It can use a little bit more suede leather on the front bag, but other than that this 3-piece set works well. You'll need some kind of bag to carry all 3 pieces to the range since they don't attach to each other, or you can just toss them separately into your range bag.