The Brute Force ULS Athlete Sandbag is amazing. I used a lower priced alternative for a year and it blew out twice, leaked all the time, and even spewed dust when using an alternative filler (pea gravel pulverized itself after repeat use). The Brute Force sandbag is overbuilt without injuring you- no abrasive edges to catch your chest or rip your hands when doing high rep cleans. No weird seams to give you questionable shoulder bruises after doing high rep get ups. The filler systems to solid and takes a beating. Good to know that 60 pounds of sand will fill the filler to near capacity making the Athlete size pretty rigid. If you want a more unstable load while using a filler try the larger size Strongman. Highly recommend.