See my other thread for the calculations on both bags, they both calculate to less than 900lbs. As the guy from fatsac.com explained to me the bags bulge so you can't calculate internal volume, and then the weight, based on a rigid rectangular box. He also said the 24 x 24 x 50 is not measured seam to seam, it is bulge to bulge.
Gil Hebert
2014 Mojo