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.
1 PS Form 2976-E is approximately 10-1/4 inches wide and 7-1/4 inches high. 2  The maximum size dimensions for Priority Mail International parcels vary by country and are noted in the Individual Country Listings.riority Mail International service is considered a parcel stream for mail exchange purposes, with the exception of Flat Rate Envelopes and the Small Flat Rate Priced Boxes.