Train your body and your mind with the sandbag system. We've gone back to the basics to develop a simple sandbag that specializes in durability and versatility. Here's why you need a Sandbag Trainer from Fringe Sport: Heavy-duty Cordura construction - the same thing military-issue rucks are made of.The zipper (a common failure point) is a military-grade YKK zipper, which is protected by a Velcro closure.The seams are double-stitched and box-stitched at all stress points.Whole bag is reinforced with lashing.Works with just the shell, or the shell + fillers for a modular solution.Small trainer comfortably fits up to 60lbs of weight.Large trainer comfortably fits up to 100lbs of weight.Small Bag comes with two top handles (7.5") and two tab handles (4").Large Bag comes with two top handles (8") and two side handles (4.5").**Note that this is a sandbag system- it is shipped unfilled, but sand or rubber mulch is readily available at your local home improvement store. Sand sells for about 4 dollars for 50 pounds. Sandbag training is a core of functional fitness. Try some ground to shoulder or a simple burden carry or sandbag get-ups for time. You'll develop your mental fitness as well as your work capacity. Our filler bags are durable and built to withstand any slam, toss, or beating you give it! We spent just as much time engineering our filler bags as we did the actual shell of the sandbag. Our filler bags are made of heavy-duty cordura construction - the same thing military-issue rucks are made of. They will handle any beating thrown their way and won't leak or spill sand into the shell of your sandbag. Size does matter! Small trainer (top image) comfortably fits up to 60lbs of weight.Small Bag comes with two top handles (7.5") and two tab handles (4"). Large trainer (bottom image) comfortably fits up to 100lbs of weight.Large Bag comes with two top handles (8") and two side handles (4.5"). Durable & versatile. The best 1-2 punch you could look for in a sandbag! If you're looking to spice things up with your workout routine, sandbag trainers are a great place to start. Try some shoulder to overhead, burden carries, or front squats in your next workout and see what true functional fitness feels like!