Homebrew PCBs

Hello all, the $25 GBC Personal Laminator it says to use a carrier with the laminator - is this really needed?  I've just used a piece of paper folded around the item as a carrier.

OR is the toner transfer paper wrapped around the copper board all that is required?  It seems to feed thru just fine and isn't that the only reason for the carrier - to assure the item does not wrap around the roller and feed out the back?

Thanks to all for comments.

Ken H> K9FV