Ski/board equipment (if not renting)

Skiing and board accessories

Powder ribbons or straps (if going to destinations with very deep powder)
Lift pass holder (if going to resorts that provide little cardboard tickets e. g. various resorts in Hokkaido such as Furano)
Board leash
Wax and iron if you want to DIY, petex
Ski holder strap - to hold your skis together
Ski/board lock
Boot/hand warmers

Safety gear

Skiing/boarding clothing

Face mask - if going to a particularly cold or windy destination such as Niseko or Lake Louise
Hood or hooded top if going somewhere particularly cold
Neck warmer
Silk or merino wool glove inners - particularly useful if taking photos or video footage
Thermal pants (not cotton as it captures the moisture)
Thermal top or other under-layer (not cotton as it captures the moisture)
Fleece/s - vest and long-sleeve
Helmet
Goggles
Headband (or ear muffs if you're game!)
Beanie
Ski jacket
Ski pants
Jacket hood
Ski gloves
Glove protectors (if going to a resort with nutcrackers e. g. New Zealand club fields)
Ski socks (thin ones)
Waterproof spray?

Other clothing

Other things for the ski/board jacket

"First aid"

Toiletries

Luggage

Electronics

Other

Cabin luggage

Small toiletries for cabin luggage in small sealed plastic bag including toothbrush and small toothpaste
Sleeping tablets/pain medication
Ear plugs
Blow up cushion
Eye shades
Book
Wallet and credit card
Cash
Itinerary and reservation confirmations
Maps and directions
Passport and visa if required
Airline tickets
Eye glasses or contact lenses (and accessories in main luggage)
Don't pack razors, scissors, matches etc - check for prohibited items

Things to do before travel

Make sure passport is valid for at least 6 months
Organise any visas required
Get any necessary vaccinations (e. g. if travelling to India)
Organise international drivers license if necessary (e. g. Japan)
Set up a "web mail" account so you can access your email from any internet kiosk
Email your itinerary to yourself in case you lose it
Mobile phone to international roam - check it works in country you are going to
Organise wireless internet connection if you're taking your laptop
Check electrical adapters required for the country
Photocopy passport, visa and tickets
Leave itinerary/contact information with family member and leave photocopy of passport
Consider currency exchange for at least a small amount of cash
Pay off credit card
Pay bills
Organise mail to be collected or "stopped"
Travel insurance
Set up pet care