Use clean cartons designed for moving. Boxes obtained from grocery or liquor stores are not always clean, and they may not withstand the weight of the items that you'll be putting in them. Also, their odd sizes tend to make loading more difficult.
This 2-piece set protects mirrors, artwork, glass shelves & doors. One piece fits into the other and "telescopes" to adjust to just the size you need. For maximum protection wrap each item in unprinted newswrap or bubble wrap before placing them in the box.