Instructables
Picture of Bicycle fender made from a plastic jug
This details a simple way to add a virtually free fender to your bike to keep mud/rain/blood off of your duds. This design uses recycled materials and the only cost is your time. The presented design uses a rear rack as the support, but you could easily use some other found items such as wire from a tomato cage or similar to provide structure for the fender. Face it though, your bike needs a rack so just get one, or view my instructable (coming some day) on making your own bike rack out of used automotive brake and fuel line and get to it.
 
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Step 1: Materials

Picture of Materials
The materials for this are easy to find. You need a plastic gallon jug. I used a windshield washer fluid jug since it had vertical sides and was pretty thick. The circular indents and thin plastic on a normal milk jug make it less desirable, so keep an eye out for a thicker jug like those used for vinegar, windshield fluid, etc. Pretty much anything will work. You will also need a pair of strong scissors or a utility knife to cut the plastic.

Additionally you will need electrical tape or some zip ties or other method to secure the fender to the rear bike rack.

The figure below shows the kind of jug I used, along with a pattern that I used for the fender.
skoster1 year ago
Great design. I'm gonna create a fender for my upcoming DC to PGH bike ride in Sept. I did PGH to DC last Sept and really could of used a fender like this. one of the days was rain and lots of muddy puddles. Well done :)
BillBiker3 years ago
Wow, you know this was going through my brain for almost 1yr. using soda bottles. I really never got around to making an attempt to put it together. Very awesome instructable and 10x better then the idea I had. Thanks for making it happen :) .
jmengel (author)  BillBiker3 years ago
Thanks. I just had a muddy ride in the "tri-loppet" race this weekend and the jug worked wonders at keeping the mud off my back.
bobdog4 years ago
Try the huge bulk oil jugs from chinese or fry restaurants, 3-5 gallon usually.