I'm going on vacation and can't bring along my weights, but I'd like to keep up my workout.

I've tried fitness bands but they often seem a bit too light for me.

I'd like fitness bands (or another alternative if one exists) that:

1.) are fairly heavy resistance -- I'm not a heavy body builder but I am a reasonably strong man and would like something that can make me sweat

2.) are fairly low maintenance -- don't need to be rigged or mounted to a door or something.

Any suggestions on specific bands that will suit my purposes, or another alternative?

thanks

I have a set of the Extra Heavy weight bands that I use spurratically and they seem to be just fine.