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: If you are using FedEx Ground or need specialty "stay-flat" rigid mailers, you must purchase them as they are not complimentary for those services.

: Sites like Amazon and Alibaba sell bulk packs of compatible heavy-duty cardboard mailers. Top Recommended "Solid" Envelope Options Shipping, Packing, and Mailing Supplies - FedEx buy fedex envelopes

FedEx Office locations, ship centers, or even from supply cabinets at FedEx Drop Boxes. : If you are using FedEx Ground or