kryogenik

Be that as it may, mate.
I've been paying £1.75 (or thereabouts to be fair, sometimes a little more) for these for a long time, they are very light, but over 150g.
Last week I had to pay £4.20 as my poster tubes are 69cm and the max is 60cm for a recorded item. Wrong or right, I'm not going to argue with a postmaster at the counter who tells me the rates have recently changed and gets a tape measure out!