Seconded. And I hate the charity packers, like the Drumchapel Dance School or local Cub Scout Group doing it. If I've lashed out upwards of £50 on the weekly shop, I want to pack the items my way, in a particular order and most importantly, not sticking a huge box of Bold Washing Powder on top of a punnet of strawberries!
Don't get me wrong, I politely refuse their offer, but still put some money in their collecting bucket. I'm not a complete shit!