I've got some posters of some photos I'm going to be giving away for both promotion and sale and I'm wondering if there is an easy way to roll them consistently by hand without kinks. Also, are there any suggestions as to the type of packaging I should put them in? Plastic poster bags come to mind (if that's what they are called) but where to buy them in bulk?

If you ship FedEx they have a free container (sturdy cardboard that folds into a triangle about 30" high).