In all current instances, Sprint provides shipping materials and pre–paid return labels to ensure the packaging meets DOT, IATA and FAA guidelines. In most instances this will be some form of Rigid Box or large 11”x14” padded envelope. If you still have one of the small, thin plastic “recycle baggies” that used to be included in the phone´s original box – please note that these are no longer allowed and must be destroyed or recycled. We have included pictures of these below to help you identify them. If you have questions please contact support via phone at (877) 443–4464, or email at buybacksupport@cartesian.com.