@bergmeister I would start by concentrating on your main pieces of kit ie tent, backpack and sleep system. For below your snowline camps I would possibly have a simple tent set up, easy and quick to erect. Your backpack weight saving can be huge. My 40 litre pack weights just 650 grams for instance. Try a ultralightweight pad and also investigate a quilt instead of a bag. A summer base weight of 5kg is achievable in time. Be warned though ... going lightweight is not cheap!