That is one problem - because it needs special luggage, one thing leads to another.
However, they're fantastic things once you have the kit. The big front pannier is just the right size for aeroplane hold baggage, and comfortably takes overnight things, A4 files and a laptop. You can always take a little rucksac as well.
I'm sure Spandex wouldn't notice one Brommie more or less. I'll lend you my Brommie pannier if you like (and if the fleet Brommies have the clip for them), but I'll need it back for Saturday, when my Brommie and I are off to see Mrs Uncle Phil in Gay Paree (just too late for the fete a velo there

)