Baggage allowance is notoriously unreliable, you can get hammered for having over 15kg, or you can take 40kg without any problems at all. It doesn't seem follow any pattern at all (in my experience), often I have been burned by allowances that others have recommended, other times nobody has taken any notice.
What are you doing about food? This is the crucial (and most difficult) question. Without food there is no way your kit should be more than 10kg - if it is, cut it down, or you'll really regret it - especially because your area will probably be fairly hilly!
Food weighs a ton, and you ideally should have your diet properly designed. You don't have to employ someone to do this - books like
Sports Nutrition by Anita Bean are an excellent introduction and have enough info to get going.
Dehydrated food is tricky because it's very very expensive to buy, and also needs rehydrating over the day, which can be tricky in a rucksack. You could look into doing it yourself, but watch you do it properly or one case of food poisoning and the trip's over - because you don't know how good the rest is.
Not sure how relevant what I'm saying now is. If you want to talk food, drop me a PM and I'd be happy to help.
Certainly consider obtaining it when you get there.
If your baggage weighs absolutely loads, because you've a basecamp type setup, use one of the excess baggage companie eg
http://www.excess-baggage.com/
Keep gear to an absolute minimum. Make a list, then cut off exactly half of it. Imagine your day, to help make sure you don't miss anything out (the last minute kit remembered often adds up to a lot of weight). Then get it all together, pack it, and weigh it (remember the bag will be between 1 and 3 kilos itself). If it's over 10kg, cut out more. Things like loo roll just aren't necessary, nor is a total change of clothes (think about a change of underclothes, trousers, and top, and always take at least one pair of spare socks! Hygiene only needs to be toothbrush, toothpaste, razor, and deo stone. Eating only needs to be a tin mug or billy, and a water bottle. Etc, etc. I'm rambling again, PM me if you want more of my lengthy opinion
www.ellis-brigham.com do a lot of hiking gear at pretty good prices. Since you're hiking rather than bushcrafting, I'd suggest you go to a hiking shop rather than mil surplus or similar.
Outdoorcode has already been mentioned
Cheers
Chris