You don't say how old or big your son is. A 35 liter bag may be suitable for his physical frame but may create capacity problems for a sleeping bag, pad, clothes, tent, food, toiletries, misc. We recommend to our clients a minimum 72 liter pack (assuming their back can accept this size).
: Thank you for your advice. This thread was started in 2016 by someone else with a son.
We are two people, my wife (169, 68kg) an I (190, 87kg). My wife bought a Tatonka Yukon 50+10, I have an osprey Xenith with 75 litres. I think more than 60 l wonŽt work on my wife, IŽll carry the food for both and the tent.
I wanted to use a Carinthia Defence 4 (which I could get for free) but I really didnŽt like it, far too tight... really claustrophobic. IŽll get another one, too.WeŽll have a look on the Mountain Heardware Lamina Z Torch next weekend. Any experience?
Pad might be Thermarest NeoAir xlite. IŽm not sure if itŽs worth it.