Elisa Congrats on going to Amsterdam. Great place. OK, to be more helpful on pniackg information, we'd need to know how long you'll be gone. Personally, if I was going for two or three weeks at this time of the year with only a backpack, I'd pack four of everything; pants, socks, underwear, and long sleeved shirts. Two t-shirts, two sweaters, decent walking shoes that look nice enough for a mid-range restaurant and a rainproof jacket. You'd wear one pair of pants/socks/shirt/sweater/etc. on the plane and have the rest in your backpack. Do laundry when the clothes get too funky.As for essentials, all I consider essential is a camera, passport, and ATM card. You're going to Europe, not Mars. Anything you need or forget will be within easy reach. Take any medications that you'll need, but don't go pniackg huge bottles of shampoo or whatever.In terms of confirming your flight, as long as you have your ticket you don't need to confirm. I've *never* confirmed a flight to/from Europe, which is NOT to say that you shouldn't; just that they won't cancel your flight if you don't confirm. If you'd feel better about it, go ahead and call up the airline 1 day before your scheduled departure. They'll be happy to reconfirm. Oh, and if you bought your plane ticket with a credit card remember to bring that exact credit card with you.And for getting from Amsterdam > UK, check out EasyJet (www.easyjet.com) or any of the other low-cost airlines. Getting from the UK to Norway can be looked into here: skyscanner.net/Best of luck, and have a great trip!