How To.....make your own piping bag

This is a neat little trick I learnt recently from my college tutor which has proved so useful I wanted to share it with you all.  There are loads of different types of piping bags out there, different sizes, re-usable, disposable etc.  Up until now I used the re-usable ones but they're an absolute nightmare to get clean and if you're piping lots of different colous of icing it can be a right faff cleaning them between each colour.

But with this handy trick you can make your own piping bags, whatever size you like and all you need is a square of greaseproof paper and some scissors.