Same here Tigger
I started using them in the early 70s, we never had bait boxes in those days as kids all we had was maggot bags.
When we visited the tackle shop on a Friday night for a 1/4 pint of maggots 25pence worth if I remember correctly. The tackle shop lad filled your bag with maggots and knotted the cord around the bag and off you went. The maggots stopped in the bag until Saturday morning. Providing you wrapped the cord tight around the bag and knotted the end they never got out.
Cant speak for everywhere in the UK, but at least around here " Durham" the Maggot bags have remained popular ever since.:thumbs:
My local tackle shop still sells them PM me if your in desperate need anyone.