Our buckled strongman sandbag is improved on the basis of our Strongman sandbags. It can be better to prevent the strongman sandbag opening zipper bursting. More stronger! Its function is same as Strongman sandbag. You can do hug,fall,move… training with heavy weights.It can replace bulky balls and stones, and it can be easily carried around. Strongman Sandbags can be emptied and then re-filled at another gym, field, park, etc., they function as uniquely portable Strongman training tools for athletes of any experience level. There are no restrictions on gym training places. It can be filled with different material to adjust weights,like sand, gravel, food…… Buckled strongman sandbag is made of 1050D Cordura,100% nylon,YKK zipper,double- layered, strong thread with 3 stitches.Each Sandbag has a built-in filler bag with an additional zipper and hook-and-loop closure—ensuring filler material stays fully contained as you work through your regimen. There is 2pcs small handle on the opening funnel,you can open to fill material easily. Loadable weight of the Strongman Bag depends on the density and size of the media being used. Certain media may cause the overall weight of the bag to be greater than or less than projected weight capacity. Due to the nature of the fabric and the directed use, the Strongman bags may expand over time with use. Additionally, these bags are not prefilled. Specifications: 1.Color: black,red,army green,blue,yellow,brown,light camo,dark camo. 2.Material: 1050D Cordura,100% nylon.YKK zipper 3.Dimension: 41 diameter or 16” 4.Custom Size: 20kg-200kg, 50lb-400lb 5.Built-In Filler Bag 6.Zipper and Hook-and-Loop Closure 7.(Filler Material Not Included) 8.Custom logo for any qty, like 1pc is ok. 9.do printing logo,embroidery logo,sewing logo.