Yes of course UPS envelopes are free, I have a box full of them. The brown clasp envelopes I was talking about are what I place the documents into. That envelope is then inserted into the FedEx or UPS envelope. It serves as additional protection since the UPS/FedEx cardboard envelopes have been known to burst open with a big stack of documents.The clasp envelope I was asking about just serves as additional protection incase the cardboard UPS/FedEx envelope bursts open from an extra large stack of documents.