The package contains four sandbags. You can easily adapt to your daily strength by adding or removing the filler bags. Therefore, this sandbag is suitable for people with multiple fitness levels. Multiple gripping training options. Use this powerful multi-function training device to perform smashing, pushing, smashing, throwing, stabbing and running. No sand leaking The outer shell and filler bags are made of 900D oxford fabric more durable and damp-proof.