By the way, the plastic mallet the guy loaned me weighs 7.2 oz, just barely heavy enough to drive the sticks into the ground. I made a mallet that weighed only 5.1 oz when empty and weighed 16.5 oz when filled with rocks and water. I made larger and smaller ones. The lightest is 4.2 oz empty and goes up to 14 oz when filled. The heaviest weighs 1 lb 14 oz empty and goes up to 6 lbs 7 oz when filled (I call that the "sledge hammer").