Containers for Lead Ballast

For those collecting lead shot from tire shops or similar, what are you putting the lead in for a clean, easy install? It seems like the capped off round PVC pipe I've seen used might roll around inside the boat compartments and possibly cause problems. Is this really a problem with PVC? Does anyone use containers like bags, tackle boxes, etc. or are there any other recommendations besides melting the lead and molding bricks? I would like something that makes the lead ballast clean, secure, and easy to move around inside the boat.