: You can order flat rate boxes and envelopes for free from the USPS Postal Store . They are typically delivered to your door in packs of 10 or 25 within a few business days.
: The container flaps must be able to close naturally and be taped flat. If the box is bulging or altered, the carrier may reclassify it as a weight-based shipment and charge you more. Step 3: Purchase and Print Your Postage buy flat rate postage online
: If you’re in a rush, most local post offices keep small, medium, and large flat rate boxes in stock. Step 2: Pack and Prep Once you have your box, place your items inside. : You can order flat rate boxes and
: For USPS Priority Mail Flat Rate, you can ship up to 70 lbs domestically. If the box is bulging or altered, the