Types of Bulk Mail

Postcards

Minimum dimensions 5 x 3.5, 0.007" thick

Maximum dimensions 6 x 4.25, 0.016" thick

Minimum dimensions 5 x 3.5, 0.009" thick

Maximum dimensions 11.5 x 6.125, .25" thick

Must be stuffed and sealed

(large envelopes, some newsletters or booklets)

Anything that exceeds any one or more Letter dimensions but falls under maximum dimensions (such as 8 x 10)

Minimum dimensions 11.5 x 6.125, .25" thick

Maximum dimensions 15 x 12, .75" thick

Must be tabbed correctly

Could mail as a letter or a flat, depending on dimensions