I keep my toiletries pre-packed in this quart-sized reusable bag, and refill or replace them after I return from a trip before placing it back in my suitcase.
Toothbrush
Toothpaste
Floss
Tongue scraper
Cleanser
Toner
Daytime serum
Nighttime serum
Moisturizer
Eye cream
Sunscreen
Face oil
Moisturizing mask
Sheet masks
Eye masks