This Kelty Sanitas 34 Backpack for Kids is an external frame pack built in the classic style, with adjustable torso size and adjustable shoulder harness.
Gregory Mountain Products Icarus 40 Pack for Youth is quality but affordable fully-featured hiking pack designed with an adjustable shoulder harness so it will grow with the kid.
In this text, I present best hiking backpacks for kids and youth in the range from 12 to 70 liters. Most of them are with an adjustable harness and hip belt, and suitable for hiking tours of various lengths dependent on volume.
I shall start this Osprey Poco Premium review with a strong statement: in my view, this is the best product of this kind on the market. I do rank it above the very similar Deuter Kid Comfort III model due to reasons that will be made clear in the text below.
Kelty Yukon 48 external frame pack has been around for many years now. The version presented here is the latest from 2016. This is a pack for growing youth, with an adjustable harness.