These mudguards are small enough to keep in the bottom of your bag for whenever you may need them AND this whole instructable cost me only £1!!!
Step 1: Find your material!
Step 2: Mark out the rear mudguard
Step 3: Hole punch and score
I chose to score a line down the middle of the mudguard on the top side. This scored line will allow the plastic to flex upwards much like a conventional mudguard.
Step 4: Mark out and cut the front mudguard
Make two holes and link them with a single slit. The rubber band will loop through these holes and over the frame.