I need a reccomendation for a bath tub for my son:]?

my son is 17 months old about 25 pounds, and im staying at my fiances parents house, and the bathtub is old so i use a "baby bathtub" we had the rubber duck one but it keeps breaking on us like poping the othe plastic ones say up to 25 lbs, do not exceed. so im not too sure what bath tub to get him! please no ignorant comments :]