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The Gladius Strongman Sandbags are made of 1000D Nylon Cordura® and equipped with a funnel-shaped filling bag with an ultra-durable double Velcro closure. Externally, the bags are sealed with a zip and an additional Velcro overlap. Be sure to load the sandbags within the maximum sand load indicated. The maximum capacity of each bag may vary depending on the material used to fill it. We recommend using pre-dried sand (Dried Sand Bag) to prevent the natural moisture of the sand from damaging the product, which will void the warranty. Gladius Strongman Sandbags are available in weights 31.8Kg, 45Kg, 68Kg and 90Kg. Please note: the use of an inappropriate loading material may result in the bag changing shape and/or limit the bag's closure and seal, causing breakage and thus voiding the warranty.