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.
Typically, large envelopes are sent in an envelope large enough to fit an unfolded 8Â½â x 11â sheet of paper. Envelopes used for flat mail cannot be more than Â¾â thick, 12â high, 15â long or weigh more than 13 ounces. The USPS considers any envelope bigger than this size to be a package, and will be subject to parcel prices.