I finally took my son out on his first backpacking trip this past weekend and I noticed how little room his biggest school backpack has. He's a lightweight at 43lbs and I dont want to overwhelm him which is why I carried half of his gear. Is there any decently priced packs for my young pup that has a external frame and a hip belt? Any help would be greatly appreciated. I'm estimating 15 to 20lbs of gear. Suggestions for lightweight gear to fill the pack would also be awesome. Than you for reading and happy hiking. Jason