My second strongman bag purchase! (100 pounds bag still in use, especially for warmup and strength endurance) Got about 140 pounds of sand in this 150 pound bag. After a few workouts, the fabric has stretched some and settled in. Looks like adding the last 10 pounds of sand will be no problem. This type of sandbag-to-shoulder, bear hug carries, and sandbag box squats are really the only heavy lifts that dont bother my 47 y/o shoulders. If I had to choose only one strength training item for h...