I've purchased the Next Alpha Sandbag Workout Bag 5-25 KG. However, using the end handles to move it around when weighted resulted in a burst seem already within the first workout. Other problems also occurred - and after being in contact with the seller it resulted in a refund. Before buying another Sandbag from Next Alpha I would like to see a more thorough breakdown of their product on their homepage, including making sure reinforcements at the end-handles are introduced into the design. The basic idea behind a scalable sandbag is nice. If this is implemented I wouldn't avoid Next Alpha products in the future.