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At a Glance Boston's ban on plastic carryout bags took effect Friday.For now, it applies only to stores that are 20,000 square feet or larger.About 350 cities, counties and states have banned or taxed plastic bag use. Boston has joined the growing list of cities that have banned single-use plastic bags. Boston's ban took effect Friday for stores that are 20,000 square feet or larger. The ban only applies to "checkout bags," the , according to the city's website. Retailers...