If you've been to the San Diego Comic-Con International in the past few years, you've no doubt come to expect seeing/using Warner Brothers' free totes bearing timely promotional images for its TV shows, movies and comics. The bags are back again for 2011 but with a significant upgrade, however, converting to backpacks of the same dimensions that retain a poster tube. There's a dozen designs to choose from this year, but the ones that'll likely interest you the most bear images from DC's relaunched Justice League, Cartoon Network's upcoming Green Lantern: The Animated Series and Rocksteady Studios' approaching Batman: Arkham City. See a selection of the bag designs after the jump.From WB's official press release:

More than 130,000 of the signature, oversized (24"x28") bags - dubbed the Con's "ubiquitous accessory" by Entertainment Weekly - have been produced, and will be available to fans attending Comic-Con upon checking in throughout the five days of the convention, including Preview Night.

See select bag designs below: