I think it depends on weight and thickness as much as size, so you might find it clicks over to the next level. Marlynn had a problem with some tags she was sending me for the CJ, so its probably safest to get the PO to weigh it - take your 80c stamp and they can just add the difference (no sense it lying around to get lost like mine always do

). There's honestly no rush so please don't make a special trip.
Now I need to get my sister a very nice birthday present so she will let me play with her laminator