Used but plenty of life left in this carrier. Does not include instructions. If you purchase this, please find instructions online to make sure you’re using it correctly. Details from REI website: Features Auto-deploy kickstand extends and retracts smoothly thanks to internal spring-loaded system (no bungees) Five-point, adjustable harness system is anchored directly to frame and features an easy-to-use central tensioning system similar to car seats Curved, molded foam shoulder harness with sternum strap and padded hipbelt evenly distribute load Mesh backpanel with sliding torso-length adjustment allows easy fitting changes between short and tall parents Cockpit offers a reclining position, allowing child to sit naturally and comfortably Double-hook seat height adjusts quickly and easily Under-seat storage compartment accommodates toys, snacks and a change of clothes Carrier also features hipbelt storage pockets and toy loop attachment points 3M reflective tape accents provide 360° of visibility Manufacturer recommends a maximum weight limit of 50 lbs. for child and gear Made from durable 600-denier polyester and brushed nylon Imported. Requirements for your child: Your child must be capable of holding their head upright and sitting up by themselves. Usually a child older than 6 months is able to do this. It is a good idea to ask your pediatrician if they think your child is ready to ride in a child carrier. Questions? Leave a comment below!