Priority Mail Small Flat Rate Box 8 5/8" x 5 3/8" x1 5/8" – Stamps.com Supplies Store
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Foil Insulated Box Liners - 8.5" x 1.5" x 5.25" (Fits in USPS Small Priority Mail Boxes)
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Small Flat Rate Box
TIL: when shipping brass, bullets or lead, 6 USPS small flat rate shipping boxes fit perfectly in one medium flat rate box. Great reinforcement. : r/reloading