Part of the cost savings associated with automated collection results from lower hauling costs in collecting recyclables on an every other week schedule. As such, customers will have more recyclable materials to store between collections.
For garbage, the City recommends the larger carts primarily for two reasons. First, if customers have an occasional party or family gathering that results in more garbage in a given week, the larger carts will provide some extra room and hopefully prevent the customer from having to make other arrangements to properly dispose of the excess garbage. Second, if there happens to be a winter storm on a customer's collection day the customer may find it more convenient to not put out the cart during the storm. The larger cart may enable customers to go 2 weeks, if needed.