We used to have a local "pop" factory called Lowcocks that supplied all the shops in the area. Their bottles were beautiful, half frosted glass with the name embossed and a large rubber stopper which made a delicious squeaking sound when you pulled it out.
There was tuppence refund on a returned empty and we used to get paid in empties for running errands in the neighbourhood.
One local shopkeeper was a little careless in his storage of empties and we were able to make a fast profit by taking bottles in for refund and then running round to the yard at the rear, where the crates of empties were stored, and repeating the proceedure for as many times as you dared.