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There is no standard for USPS shipping boxes, size and type all depend on what you are shipping. You can go to the USPS website and order many different sizes and types of boxes, envelopes, and labels for no charge. They will deliver them to you also at no charge.
Yes, USPS offers boxes. You can buy them online or in your local post office.
You can get free wholesale shipping boxes on BoxGiver
The USPS offers shipping boxes for it's customers. These are available for free on their website.
USPS does offer bubble bags in all sizes online.
Yes, they offer several sizes of envelopes and small boxes. If you have a large box or parcel, you may need to do your own packaging.
It would be at the discretion of the shipper. Flat rate could be either USPS, UPS, Fed-Ex or whatever method of shipping is chosen by the shipper for a "Flat Rate". Also, USPS has flat rate boxes and envelopes.
The USPS offers information regarding their various sizes of boxes on their website. https://www.usps.com/ship/service-chart.htm? From Priority to Express, it lists sizes & prices for shipping.
The fastest shipping method is overnight shipping, offered by USPS, FedEx and UPS. It is also the most expensive. The most economical fast shipping option is USPS's priority mail flat rate boxes that deliver in two days.
The USPS have a few dozen rules and regulations regarding shipping boxes. To receive a complete list of all regulations, visit www.usps.com.
Your local post office sells shipping supplies including boxes, bubble wrap, and tape. An added bonus is if shipping using USPS priority mail, boxes are free. Office supply stores such as Staples, Office Depot, and OfficeMax sell a variety of shipping supplies including boxes of many sizes. These should be readily available in most communities. Most office supply stores, and shipping centers sell these for a low cost. The post office is another great place to obtain boxes, and have low rates for shipping them. Also, you can find them in department stores, such as Wal-Mart or K-Mart.
The US Postal Service offers free boxes. These are restricted to use through the USPS.