If you need to pack fragile items in a box, Instructables user jessyratfink recommends protecting them using all of those plastic grocery bags you probably have lying around.
There are lots of cheap materials you can use to pack fragile belongings, such as newspapers or even your own clothes. But with newspapers going the way of the dodo, plastic grocery bags may be the next perfect choice since almost everyone has a few of them scattered around the house.
Jessyratfink recommends laying the plastic bag flat and folding it over the edges of your fragile item, but you can also just use the bags to fill the empty space in your box. The main goal is to prevent everything from clinking together, since that's what causes the breakages. Hit the link below for more info and step-by-step instructions.
Using plastic grocery bags to pack fragiles [Instructables]