Tower made of straw

Aim: To make the highest tower as possible out of 20 straws and 60cm of tape. The tower should be able to support at least a mass of 20g.

I think our tower was very tall and has a good shape and looks very strong but when we put the weighs on it started to bend a little and it fell. If I did this next time I would think more about the way it is built and the weak parts of the tower if we build it like this, or add a triangle shape at the inside edges to make it stay up longer.