Most modulars will fit in a USPS Priority Mail 1-3 day, Flat Rate Medium Box for $13 - r/brickswap
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What Priority Mail® Flat Rate Boxes Are Available?
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USPS Discontinues Priority Mail Flat Rate Large Board Game Box
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USPS Medium Priority Mail Insulated Box Panels.
Can I ship a box like this? Technically a medium flat rate box and 1.5 priority shoe boxes taped together, but just under 5 pounds. They are knee high platform boots that
Wholesale Priority Mail Forever Prepaid Medium Flat Rate Box 1 (SKU 1895382) DollarDays
Why you shouldn't use Medium or Large Flat Rate Boxes | Pirate Ship Support
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What Priority Mail® Flat Rate Boxes Are Available?
USPS Priority Mail - Free Boxes, Sizes and Flat Rate
Can I Cut Down USPS Boxes to Get Cheaper Rates? | Shipping School
USPS Priority Mail - Free Boxes, Sizes and Flat Rate