10" X 13" POLYETHYLENE SHIPPING ENVELOPES Description10" X 13" POLYETHYLENE SHIPPING ENVELOPES without padding SELF SEALING The perfect shipping/mailing container for anything which does not need crush protection, such as prescriptions in HDPE(High Density Polyethylene) Packer Bottles. 10" X 13" POLYETHYLENE SHIPPING ENVELOPES without padding SELF SEALING The perfect shipping/mailing container for anything which does not need crush protection, such as prescriptions in HDPE(High Density Polyethylene) Packer Bottles.