text: how do you use parcel post and all that other stuff when sending out for ebay? you know the boxes that are set out in the post office for anyone what is that? and how do you get other stuff? get a home scale so you can weigh what you're sending out.  unless you use a flat-rate box or envelope, what you send costs a certain amount based on how much it weighs.  using paypal or the usps online service, you can print a postage-paid label reflecting the item's weight.  parcel post is the postal service's standard package sending service and may take up to a week or so for deliver; priority mail is 2-3 days.