The 20lbs-80lbs models max weight capacity is the weight purchased. The 100lbs-140lbs max weight would be 140lbs. Empty pockets can be filled by purchasing weights later on to fill the weight vest if needed. The Cross101 Adjustable Camouflage Weighted Vest is a great way to add resistance to your workout. This is a great vest to start your cross training, strength training, and anything else you will need a weight vest for. The vest is one size fits most.