A completely sealed bag means no dust after being slammed. Hammer Strength took the best characteristics of sand bags, slam balls, kettlebells and hand-grip 

Customers expect at least 30 days to return an online purchase. But only 5% of shoppers say they return online orders more than 30 days after purchase. Being lenient with return time limits (e.g., a 60-day vs. 30-day policy) can actually decrease returns by creating less urgency around returns for the customer.