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Free Shipping Supplies | USPS.com
Results 1 - 18 of 56 Forms Labels ; Priority Mail Tyvek Envelope 15(L) x 11-5/8(W) ; Priority Mail Flat Rate Padded Envelope 12-1/2(L) x 9-1/2(W).
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Postal Operations Manual - About USPS home
Receptacles or USPSB1118, Postal Service specification, Cluster Box standard-size telephone unit, vertical-type receptacles may be placed in two tiers.
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USPS Shipping Supplies - University Mail Services
Priority Mail Box #7. Size: 12 x 12 x 8 GREAT size for sending baseball caps. Weight limit: 70lbs domestically, 4lbs internationally.
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