The Deuter Aircontact Lite 45+10 SL is a one of our largest packs.  The best part about this pack is it can fit a young explorer but has the volume to take them into the teen years. The perfect lightweight companion in the backcountry whether you are climbing or touring.  Very light for its size, this design takes some of the burden off young explorers. This pack is fully adjustable from 14-18" torso lengths. This is a great pack for your older explorer who is still growing.  Keep it light and synched down in the earlier years and take advantage of all its features as they grow into a teen.