Review on 🐱 Vesper Cat Tunnel by Catit by Stephanie Smith

My cats are 1 and 2, both weigh about 10 pounds and they LOVE this rocket! They regularly sleep in it or in the tunnel. They play rocket and attack each other through smaller holes. The main problem is that if they use a bigger hole on the 2nd level, the rocket often capsizes. The fabric and mesh feel durable, but the rocket keeps leaning forward after a few drops. I need a creative way to increase the weight on the ground so it doesn't fall off. If someone has done this successfully, please report!