You can attach the practical 6 l pouch to most of 30 l backpacks and thus increase their volume. Pack everything you need and adapt the backpack to the your expedition.
You can store larger equipment in the main compartment and small items in the smaller compartment. A practical organizer and mesh compartments keep everything in its place. Just reach in and pull out what you need.
Buy Tasmanian Tiger® Multipurpose Pouch VL for € 30