Tim Roll-Pickering wrote

Well if you have a rucksack you have to do that or else call the
helper
for everyother item as it does not register as the sensor does not
really hold a rucksack.

At all of Sainsburys, Asda and Morrisons I've regularly placed my own

backpack in the bagging area. Once the supervisor flicks a switch
it's
perfectly okay to load up the bag directly without having to verify
every
single item. Maybe some other supermarkets use less flexible
equipment?

I tried it several times with a ordinary reusable bag but never got it
to work and gave up - there is no indication that supervisory action is
needed.

Same with "Press to begin or swipe card" - do you have to press AND
swipe ?

--
Mike D