Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Poorly designed training bag

Every time I punch or kick the bag, the damn thing dumps over. I filled the base with sand....it dumped over. Added water in addition to the sand for more weight....Dumped over. Absolutely useless for anyone who knows how to punch or kick. The only way to stabilize the bag is to have someone stand behind it and hold it. The bag itself is far too light (fill with foam pool noodles...What's up with that???). The base is too narrow. I wasted $250.