First Class Postage Rates 2025 Large Envelope. Usps first class large envelopes and flats can have a height ranging from 6 ⅛” and 12”, a. The price for each additional ounce also increased from 24.

The latest canada postage rates 2025 [updated] the canada post postage rates depend on the mail item, weight, and the destination country. Usps has increased postage rates effective july 14, 2025.