Air travel luggage case (locked) under the bed or on top of the closet (or wherever else you store your luggage cases). Most people who might see it will assume it is sitting there empty awaiting your next vacation. If they do pry, and find it locked and weighty, you need some excuse for what is in it (your collection of comics / magazines / vinyls / etc. which you'll get around to sorting / selling one day).
You can subtly carry items in (and out) of the house in a casual backpack, but not in large quantity!