Dude i reckon you should just get an msr and run it off petrol. Gas is a pain in the arse to find (even in europe) and more expensive too!! I travelled with around 25kg of stuff generally. Most airlines will not sting you for excess baggage. Air asia were the only ones that have ever hit me up. I then took all my stuff out and got it down to 3kg over. They were fine with that. Maximising carry on is the key. Stuff it with your heaviest items. If your still over wear as many clothes as you can and stuff your pockets with stuff. Travelling is definently the coolest thing about being a climber. I'm getting excited just thinking about it!