AppAdvice has teamed up with Musubo in order to offer you a chance to win a RubberBand case ($29.99) for iPhone 4 and iPhone 4S.

Just like the little rubber loop it was inspired by, Musubo’s RubberBand case is simple, soft, vibrant, and efficient. Constructed of thermoplastic polyurethane, the case is flexible, grippy, and gives off that wrapped in rubber bands look.

The sleep / wake and volume buttons are covered for protection and a seamless look while the ringer switch, camera, and ports are obviously exposed for proper access. In addition, there’s a loop located near the top for attaching a lanyard, key chain, charms, or whatever else you come up with.

Packaged with a screen protector, micro fiber cloth, and foldable video stand, RubberBand is available in yellow, baby blue, black, chartreuse, orange, red, rose pink, sky blue, or neon magenta. For this giveaway, we’re offering the winner a choice of black, chartreuse, sky blue, or neon magenta.

To have a chance at winning a RubberBand case, leave a comment below telling us which color you’d prefer before Oct. 7 at 11:59 p.m. PDT. Only one entry per person is allowed, and limited to residents of the United States. Please be sure to also check your junk email box.