
Citi Bike yesterday unveiled more than 100 new bikes with larger, three-sided baskets, as seen here docked outside Cooper Union.
Motivate, Citi Bike's (now former) parent company, reportedly tested the baskets with riders and received a positive response. They'll be standard on new bikes now, per Streetsblog.

Unlike the old design (done this way to prevent people from dumping garbage in them, as Streetsblog noted)...

[Image via Citi Bike]
... the larger size will likely make it easier to transport pizzas and, maybe, mattresses...

[Photo on St. Mark's Place from 2013 by Julius Klein]