When I was a kid (in the 1960's), milk bottles were re-used. We left the empty bottles on the front porch. The milkman (from Alexandria Dairy, if you lived in N

When I was a kid (in the 1960's), milk bottles were re-used. We left the empty bottles on the front porch. The milkman (from Alexandria Dairy, if you lived in NoVa like me) came around very early in the morning and exchanged the empty bottles for filled ones. There was a little ice box (literally) by the front door that kept the milk cold. This service stopped in the mid 70s.