I sell on Poshmark and here are some of the items I use for that. This list may be helpful for other resellers or people just getting started.
I needed a STURDY rolling rack to hang clothes and jackets on. This does the trick! I am super happy with how solid this is and easy to move around as needed!
Heavy-Duty Rolling Clothes Rack with Extendable Rail - 330 lb Capacity Garment Organizer, 63"-78.7" Adjustable, Black
Great for organizing and mailing Clothes or other small items.
Cellophane Bags 70 Pcs Resealable Clear 12x16
These bags are so cute but also very useful to send items to customers. I usually put the clear bags around items to store. Then pull those and put in these bags to mail for double protection.