Fat Sac Fly High Pro X Series
The Heavy: This bag measures 20 by 20 by 50 inches and carries 750 pounds of water. It's made out of Valmex, and the seams are welded and taped. Fat Sac says the quick-connect valve system pumps water 10 times faster than others, and it's available in black, red, yellow, blue and gray. In reviews at overtons.com, it gets 4.8 stars out of 5.