plastic bags
The retail giant said it was inspired by the BBC series Blue Planet.
They'll be double the cost of its regular plastic ones.
Boots and Lloyds pharmacies have some annoyed customers.
"You automatically assume they will degrade more quickly."
Small retailers may also have to charge for single-use bags.
Use of disposable carrier bags has declined by 86% since the charge was introduced.
The bags would have made it impossible for the whale to eat.
'An effective way of significantly reducing the number of bags'.
The amount of single-use plastic wasted every year in the UK is enough to fill 1,000 Royal Albert Halls.
It will come into effect in 2020.