I love my gravity bong, got it in a nice plastic cup so its portable while sitting on the couch.

And actually, I go through less weed with the gravity bong then normally smoking. It gets me higher, quicker, off less weed. I just pack a hit or two in the bowl, smoke that, wait a few minutes and hit it again if I need.

The only hassle is spilling the cup and all the water falling on the floor. Thankfully it doesnt smell like bong water much, or else the carpet around the couches would reak.