Seedlings are often packaged and shipped in plastic-lined boxes that provide both physical and moisture protection for the seedlings. Bags are used for smaller quantities of seedlings. They do not protect seedlings from physical damage. Until you are ready to plant, do not handle your seedlings individually. Leave them in their packaging to minimize physical damage.
Transportation is a vital consideration for all sizes of orders.
With bags, or bales, build a frame to allow for air flow about the packages. Cover packages with a damp canvas tarp. Fasten the load securely. If the order is small, a refrigerated van is still the best way to go. If this is not possible, and the packages fit into your car, air conditioning on maximum along with insulation and ice packs is advised.