Great for 11-14 year olds
I bought this for my boy scout at age 11, and he used it regularly until age 14, when he started to outgrow it. I'd say its good size for roughly 4'9" to 5'6" I had to teach him how to stuff his sleeping bag into the bottom compartment--it is a bit tight, but it was doable for him. The lower compartment exterior straps work great to strap on a thermarest or similar pad. It's been very durable for probably 8 nights of backpacking and another 30 nights of car camping--no breaks/tears/rips. Highly recommended if you have a mummy sleeping bag that stuffs relatively small (not good for roll-up car camping type of sleeping bags).