Preparing for strongman competitions is easier said than done. You are going to need the right tools to train properly. Rogue Strongman Sandbags can help. They provide you with an alternative to heavy slam balls and stones. They are available in 100 to 300 lb versions. Each sandbag has a built-in filler bag.
These bags have a 1000D MIL Spec US Cordura construction. You can get yours here.