There is no certain statement about this. Some courier companies provide it to sellers, and some sellers buy it themselves.

Every courier company will have a courier bag. However, they are all for more important customers. This means that unless you have a large daily shipment, you can only ask the courier company to provide it. If the delivery volume is small, let them do this and that, and people may be too lazy to cooperate with you. Generally, the daily shipment is above 10. You let them take it, they should all give it to you.

You can also buy it yourself online, usually around 1.5 1. Very small 1 gross 1.