You'd be forgiven for mindlessly going through Walkers crisps before realising that all the bags have a particular feature in common.
Moreish as they are, crisps are hard to put down. But if you do, you might join the leagues of people who have been baffled to realise all Walkers packets go out of date on a Saturday.
Fans of the famous crisps brand have asked Walkers about the detail so much that the it features on their Frequently Asked Question page.
