REI piggy-back child carrier. This carrier is AWESOME! We got it in like-new condition from the REI garage sale. Asking $50. It's in excellent used condition. Has a rear-view mirror so you can check on your kid's awake status, plus a cushion for kiddo's face if he falls asleep. Has a slot for a camel-bak hydration bladder, but bladder, handsome husband and sleeping baby are sold separately.