my two tips...
Tip #1 leave it in the car
Bring it...but leave it in the car.
Example: If you just can't part with bringing EVERY piece of pattern paper you own...bring them but leave them in the car.
Tip #2 leave it home
There are just certain things that require too many supplies to do at crops or you have too many supplies. Example: I have too many stamping supplies so I leave them all at home. I just resign myself to the fact that I can't bring it all so I pick & choose.