If you habitually run out of space trying to bring new stuff home from trips, try this: On the outbound leg, wear an old set of clothes that you’re about to get rid of anyway. Discard (or donate) them when you arrive. You’ve just regained several tens of cubic inches of luggage space. And that paperback you finished on the plane? Leave it in the hotel lobby, or at a local coffee shop that has a bookshelf.
Refilling the newly available luggage space is left as an exercise.