AMS, their is a luggage store in the Compass centre which sells various types of hold & cabin baggage - it may not be the cheapest place to buy such items but it is quite convenient.
On shorthaul (LHR), you bring all your luggage into the cabin and store it in an overhead locker or wardrobe.
You're allowed a standard wheelie + a smaller cabin bag + handbag (for girls).
Best to try not to load it with too many things as you'll be lifting/handling your own bags quite a lot!