What I do, and I've always done this, as have my circle of stoner buddies, is grab a nice fat sticky nug outta the baggie, and rip off a lil piece to put in the bottom of the bowl, over the little hole, and pack it a tiny bit, so none of the stuff i pack on top will get sucked through. Then i break the rest of the nug up into pretty tiny pieces, and pack as much as i can in til I've got a nice fat bowl.