It's best if you don't!
Our system uses the tracking numbers and packing slips for return identification to update the status of your returns. When multiple returns arrive in the same box under one tracking number but are not listed on the packing slip, our system isn't able to update the status of the extra items from "submitted" to "delivered."
Some items may be able to be returned together and our Return Center will guide you through that process, however as we do also have multiple fulfillment locations your returns may need to be sent back individually. If you send multiple items back in one box, those items may be sent to the wrong warehouse.
When multiple returns are sent back in one box, the additional items will be significantly delayed in being processed.