My parents were exactly like Anna’s, this way. And yes, it is a tradition. And it continues. :) I still make bungee cords and tree/stake ties out of old bicycle innertubes. Etc.
I rewash zip lock bags if they're not too scummy.....I do get two cups of tea out of one bag....and speaking of bags, am I the only one who still cuts up paper bags to wrap boxes in for the mail?