FYI, if you pre-calculated your postage rates prior to today, you may see an increase in certain first class mail outs, like small padded envelopes.
https://about.usps.com/newsroom/national-releases/2020/1009-usps-announces-new-prices-for-2021.htm
https://www.stamps.com/usps/postage-rate-increase/
https://about.usps.com/newsroom/national-releases/2020/1009-usps-announces-new-prices-for-2021.htm
https://www.stamps.com/usps/postage-rate-increase/