Ex Officio makes a range of quick drying clothes perfect for backpacking, lightweight travelers, or long term travel

Yes, you can fit everything for a 1 week trip into a single carry-on suitcase. It's not even difficult

On my travels, I used to buy lots of trivial things: T-shirts, bookends, coffee mugs. Even shoes. Last year I decided to only take photos. And collect fridge magnets.