Sure.
Paypal labels are convenient and can offer discounts. They are also helpful in bookkeeping.
But I rarely use them, because I have a source of discount mint postage stamps which save me even more money.
If you have a printer, a digital metric scale and a tapemeasure, you can use PP labels and drop the parcels into the nearest mailbox instead of taking them to the PO for over the counter service.
DO get a Venture One card from your PO. It will save you 5% or so on many services.
But PP labels will save you up to 18% off counter price on some parcels.
No pressure!