Help, please.
My hamsters keep escaping from their cages. One had a tube thing round the outside which collapsed, then when we put the clear plastic plug in the bit where the tube had been she pushed it out! It is now propped up with a heavy object. This morning I heard a caffufle in the wee room where they are and the other hamster was out! She had pushed open the door of her cage. I now have a large object placed on the doors ogf both cages.
It is sheer luck they are both alive, the first one was out of her cage for two nights the first time, only a few hours the second.
Hammy No2 only out minutes. We have a young cat of about 8 months who is learning to be a hunter. He is kept out of the hamster room, but they are obviously able to get out of their room when not in their cages.
Essentially, what I am asking in a very roundabout way 
for is a recommendation for strong cages as escape free as possible!
Any ideas?
TIA.