Yes. That’s what I mostly ship. Padded envelopes (with a box inside), MFRB and LFRB.
Pirate Ship will ask for the weight even for FR service but it does not appear on the printable label.
There is max weight on FR packages, like 75 pounds within the U.S. or 20 pounds internationally. So Pirate Ship will prevent you from buying a label if your package is too heavy.
thanks. so i guess it's weird that usps.com doesn't even ask, but they don't. i just created a dummy shipment to make sure i wasn't imagining things. carry on!