Otterbox Commuter Series for Galaxy S3
The Otterbox Commuter Galaxy S3 case is a good alternative to the Defender series when looking for good protection but not unnecessary bulk.
The Commuter Series does not use three layers of protection like the defender, but it is a lot lighter and easier to fit into a pocket. The case also covers ports and buttons to protect the phone from liquids. The Commuter does not include a built-in a screen protector like the Defender Series pairs well with other screen protectors. The Commuter Galaxy S3 case comes in five color options.
$21.17 at Amazon