Hi Naomi. Weird. I just googled this telescopic drink straw key ring idea to see if anyone else had thought of it. Turns out you have! :-) - What about another material. Bamboo might be too hard to work with due to size being non uniform. Maybe aluminum. Lighter. Probably cheaper. Maybe thin recycled card? Pack it flat. Like Rizzla papers. Lick em and stick em. You could have two or three in a cone shape. Push them together to form one straw.