ANSWER: Envelopes go in the RECYCLING bin. You do not need to remove the plastic window before you put it in.
If you want to put them in your organics bin, you will need to remove the plastic window, and it wouldn't hurt to rip them up.
Can go in recycling as is, tho does that mean the plastic window ends up in products made from recycled paper? What is your viewpoint re thermal receipts that have a plastic coating? I read this week that they should go to landfill or the BPA ends up in products made with recycled paper?
What about natural-fibre string?
Does it compost?
Recycling bin for envelope. Soft plastic window in my soft plastics recycling bag. Often will shred envelope before it goes in bin.
Organics with plastic window removed or yellow recycling with window removed and the plastic window to Coles for plastic recycling.
Recycling though I usually rip the plastic window out because I'm unsure on that. 🤔
Bin with the yellow lid although great for writing shopping lists.
Recycling but rip it up if it has my address on it.