You might notice that our workout sandbags are shaped differently from the competition's. This is for a very good reason. We used the competition's duffel-bag shaped workout sandbags for 3 years. We used a small, medium, and large sandbag from them weighing about 40, 80, and 120 pounds. We did all types of workouts with them, from low-weight high rep power workouts to high-weight, low-rep workouts, and some using both methods. We noticed that the duffel-bag style workout sandbags were made from a design that made the load easier to lift. And that is not the purpose of sandbag training. We also noticed that the handles sewn to the outside of the bag were very bad grips. They made it too hard to grab ahold of the bag, and more importantly, made it seem as though we were lifting the sandbag indirectly. Then we decided to make our sandbags like a flat agricultural bag but sew heavy duty industrial hose into the bag itself to make inboard handgrips. These inboard handgrips allow the user to feel the entire shifting sand load. The functional fitness benefit of this is enormous. By holding onto the bag itself, rather than external handles, the shifting sand effect is delivered directly to the body's prime mover and stabilizer muscles. And this is the purpose of workout sandbags training. But equally important is the flat, beanbag-style shape of our sandbags: The flat shape of our sandbags is more awkward to lift than the duffel-bag style. This amount of awkwardness can be adjusted by how full the sandbag is filled. The looser it is, the more awkward effect, and the better. This looseness advantage works up to about 2/3 full. After that, the lighter weight reduces the resistance. We are proud of our workout sandbags. We invite you to read our customers' reviews. Here are our workout sandbags.