Change the way you roll,

Use a decent amount of weed at the start of the joint, very little though the rest. seal it making sure the paper is loose and has more room for more weed, add more weed, stuff it with the ass of a pen, the part you want to close just fold over from four corners.

Thats how i do my "model" joints when im at a new place or with new people.
They look totally pro, and no weed falls out. You can even use the very tip of a iggeret to be the end of your joint, so when you get that nasty ass hit, you know all the weed is gone, no more roaches!

pipes are easier though.