I use a Billingham Hadley Small. Travel light.
I was considering this as an insert https://www.amazon.co.uk/d/Camera-P...5Y6E/ref=sr_1_4?ie=UTF8&qid=1486475599&sr=8-4Update.
This might work.
Mammut Trion pro 50+ and an Amazon basics backpack as the insert.
That's a better solution.I was considering this as an insert https://www.amazon.co.uk/d/Camera-P...5Y6E/ref=sr_1_4?ie=UTF8&qid=1486475599&sr=8-4