Social Security Disability back pay will be paid in a single lump sum and will be reduced by the amount of SSI already paid for months when eligibility for the two programs overlap. The second SSI installment is due this month, but sometimes the installments are delayed.
The medium flat-rate boxes for Priority service are 13 5/8 inches by 11 7/8 inches by 3 3/8 inches and 11 inches by 8 1/2 inches by 5 1/2 inches. Shipping charges are $12.65. There is one small-size box offered for Priority service. It measures 8 5/8 inches by 5 3/8 inches by 1 5/8 inches and costs $5.95 to ship.
The break even point for a large Priority Mail flat rate box is about 7 lbs. So if your item is heavier than 4lbs, use a USPS flat rate medium box. If you need a large flat rate Priority Mail box, make sure itâs heavier than 7 lbs. Otherwise, FedEx or UPS Ground will always be cheaper.Note: You can receive significant discounts on USPS shipping by signing up for a ShippingEasy account.ith the United States Postal Service jacking up their rates every 4-6 months, what used to be the most economical shipping method is now priced inline or even more expensive than some of the more reliable carriers like UPS or FedEx.