Travel light, but take everything with you. Everything that you might need. The bare essentials. Nothing that might be termed as excess. Nothing that might weigh you down, nothing that might, at the other end, end up in a cupboard or a loft, forever after forgotten and stored away.
That's the problem with belongings. You accumulate so many unnecessary things over the years, things that once meant something to you, perhaps even a lot, but that, over an indeterminate period of time, lost that once owned meaning and became, instead worthless, meaningless. The Valentine's Day card from an old lover, the magazine article, the ticket stub from a great movie, the jumper you wore to death but couldn't then bare to part with even though it grew so many holes it was no longer suitable external attire.
So travel light, but take everything with you. No regrets. That's important. The worst thing in the world, and believe me I know from experience, is to throw something that seems meaningless away and then to, a year later, two, look back and wish that you still had it. I have lost many a loved item in this way. I am ruthless. I do not shy away when it comes to clearing out and de-cluttering. It it must be done then it might at least be done properly.