6" X 9" POLYETHYLENE SHIPPING ENVELOPES Description6" X 9" 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. 6" X 9" 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.