The base of the bag will be empty upon delivery:
You can fill the base of the bag with either sand or water (or both) depending on what you're looking for in terms of weight and convenience.
DRY SAND: We recommend using 350 pounds of DRY sand for the best experience during your workouts.
WATER: Water is much more convenient and will be easier to fill, empty, and move around when needed. However, the bag will be lighter at 250 lbs, which means it may move during your workouts.
DRY SAND & WATER: You can combine dry sand & water to stabilize the bag which would bring the weight to 450lbs. However, this can get a bit messy especially if you are planning on emptying it at any point