I'm confused with what counts as supplies expenses. I work on Etsy and booth at conventions. Do the items I paid in bulk, decor, storage, bubble mailers, etc all count?

For example, the keychains I buy in bulk to sell at conventions. Do I put that down as expenses or only the remaining I have not sold and guestimate how much left the cost I paid would be? Do the bubble mailers count for shipping my orders on etsy? Do the storage containers I have for my etsy stock count? And do I put down the price I paid for all of these?