A towel is a very versicle thing, it has many uses
you can:
use it to breathe through when making your way through a cloud of con stench
use it to hide behind when you see a rabid fan girl coming at you
block out the rays of light reflecting off the sailor moon photo shoot
make it as a distraction to avoid trouble when breaking the con rules
cover up when you've had a cosplay malfunction
dry off with it when your friends think its funny to pour some bawls on you
use it for conventional methods such as drying off after the shower, so that the hotel doesnt know your stuffing the room
lay on it to watch the silly glomp circles
sling it over your shoulder to try and look sexy for the pretty cosplay girls
use it as an accessory for the swimsuit contest
it makes as a good emergency blanket when you wind up sleeping on the floor
and last but not least, the towel is the companion of the con goer and the most vital part of your inventory (except maybe fan girl spray for the bisheis...) while sure the hotel towels are nice and tempting to steal, your own towel has character, value, and a certain odor to it that wont come out no matter how much tide you use.
No matter if you are a cat girl or Hughes from FMA, the towel is the con goers ultimate necessity
with out it you may find your self susceptible to the con sniffles, con funk, and the occasional sight you wish you could un see.
A towel is also the statement of the con goer, if they can ruff and tough it through the DDR competitions, mas hysteria of the registration line, survive the drought when you realize all there is to drink is ramune, and live off pocky for three days, and still have their towel in their possession, they are the true heroes of the con goers, those who can withstand the worst the cons can throw at you and have a laughing time doing it.
So remember your towel, and hats off to you if you can still find it by the end of the weekend.