Sending parcels is available for characters lv 50 and above, while receiving parcels is possible for characters lv 30 and above. 
Parcels can contain equipment items of Epic grade or higher with the [Parcel Trade available] label.

Each character can send up to 5 parcels, and the number resets every day at 9 AM UTC+9. Please note that there is a limit to the number of parcels that can be queued for both senders and receivers, so it's advisable to check the queued parcel count in advance.