Picture of The recyclable soda bottle mudguard
There are few things in life more ridiculous to see than a fully grown man cycling in the rain without mudguards. For many years I have been that guy.

As we all know, mudguards although unquestionably practical are, almost without exception,   unacceptably ugly.

So, every time it rains many of us are faced with a dilemma.

This solution minimises the visual impact on your bike, uses materials destined for the recycling bin, and can be completed in about five minutes.
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Step 1: Materials and tools

Picture of Materials and tools
As I have come to discover not every bottle cap uses the same threading, so the crucial design decision is to choose a brand of soda that is always readily available.

The materials list is simply:

One soda bottle
One cable tie

You'll also need a pair of scissors, or a sharp knife.

Step 2: Thread the cap

Picture of Thread the cap
Cut a couple of small holes on either side of the cap and thread the cable tie. 

Step 3: Attach to your seat post

Picture of Attach to your seat post
Now just attach the cap to you seat post, tighten the cable tie, and snip off the excess.

Step 4: Looks like rain

Picture of Looks like rain
With rain on the way screw on your mudguard and enjoy a relatively dry ride.

When you reach your destination recycle your mudguard and return your bike to it's usual aesthetic loveliness.