Delivered, reused milk bottles were a product of small local dairies. They could count on bottles being returned because houses had standing orders/relationships with the local dairy. No one was trucking bottles across the state. Milk is notorious for going bad quickly. Bottles stayed in the local community.
Compare that with today, most people don’t have ongoing relationships with people you buy beverages from. Even with major breweries in every city, microbrews everywhere, everything travels much farther and is much more distributed.
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