DIY Emergency Bike Fender(s)

In the local beer store and outside it starts pouring ? You forgot to install you fenders didn't you ? Heres what I did instead of having a skunk tail on the bike ride to my beer buddies house. (Who wants that on their couch ?=P )

These are just stiff enough to stay and keep grime off your rump without needing a knife or tool to fashion for the 2nd wet half of your beer run.  Really ,any box will do .  This UPS box flap is nice cause its glossy on 1 side, giving you a few more minutes of water resistance =).

rip a strip that will fit in above the tire . Break out the cell phone for difficult scientific calculations and measurements.. Or just eye ball 

Shiny side down or up depending on how hard its pouring . 

if u ride fixed / brakeless ,this may work too. 

you've got maybe 40 minutes before these are worm pulp in a hard down pour. 
Get that precious Beer Booty to your buddy's crib ,Pronto . 

enjoy