Backglasses are best shipped in a wooden packing crate. This is best
constructed from 1"x2" and 1/4" plywood sheets. The outside edges of the
glass should be lined with a couple layers of corrugated cardboard. Both
sides of the glass should be protected by carpet padding or sheets of
styrofoam. Assemble the crate using drywall screws so it can be easily
opened and reused.