They are little heavier that Tupperware but.. a way sturdier.. small should be good to 300-400g medium up to 1000 large bigger snake.. what is funny my 1200g YB like to move his hide on his back to find the best temp spot for him.... many times iwhen Iopen tube hide has moved inch here inch there lol.. They ate easy to clean and delivery is lighting fast..
You cant go wrong with RBI!!!