I think that most states have printable licenses now.

I print off a few copies, sign them, and then spray some acrylic conformal coating on them.
The spray saturates the paper and makes it pretty waterproof. It also makes the paper tougher to tear and makes it wear better.

I keep a copy in my truck, one in my laptop computer bag, and one in my fishing hat.
My hat has a pocket on the inside with a velcro closure. That way I know I will always have my license with me.