Rubber fill, water resistant, 20-100 pounds
We first wrote about sandbag training way back in 2005, and it's still a legit training method. It's also a helluva lot of fun. The problem? The sand. Even the quality bags we've tested tend to leak after a few years of hard use. Enter the Wreck Bag. These tough bags are mess-free and pre-filled with a non-toxic rubber blend, which makes them shock absorbent and stable. The load remains evenly distributed. Clean it, press it, throw it, curl it, squat it, or just toss it over your shoulders and haul your big fat ass up a hill. The bag will survive. You may not.
– Chris Shugart