Instead of the 3 ounces of liquid, I collect trial size and individual packets of personal care items, and I do this well in advance of needing them, to avoid the stress of last minute shopping.
I won’t say we travel light, but we travel with a good balance and try to bring what we need, but limit the extras. Most hotels have toiletries, and I have found them available within a short distance of anywhere I have stayed. I purchase the travel size at my destination if I need to.
A large bottle of bath oil leaked in my luggage once. Since that time I have not traveled with full size toiletry items, even if I am not at the top of the weight allowance for luggage. I place a Ziploc bag around the items in my kit, another one around the outside of the kit, then place the kit in the plastic compartment in my luggage, away from my clothes. I have only had one minor leak since the disaster. There were a few paper towels around the items that absorbed most of it. The rest was contained and did not spread beyond the toiletry bag.
Being an organized shopper and picking these things up when I am already there, or nearby, is much more pleasurable to me. They are available in a variety of places; markets, department stores, salons, beauty supply shops, spas, and I have even scored some hair products (shampoo and conditioner) from my gym. I am not too fussed about having my favorite products; although they are available in trial size. I enjoying trying the new ones, but I will ask for a sample of my favorite perfume when I am at the department store.
My Travel Kits and their ingredients are all listed in other posts. For international voyages I combine all of my kits into two, which include; Toiletries, First Aid, Pharmacy, and Vanity. The smallest one fits easily in my handbag and the larger one will be stowed within the luggage I check below. I inquire into current regulations to leave out anything that is not welcome by security from carry-on.
In the carry-on, I include the Vanity, a Dental Kit, and a few items from the First Aid and Pharmacy. Before boarding a plane, I purchase a bottle of water or refill the one I have. It’s helps to stay hydrated, and I use it to brush my teeth with after meals. On the long flights, to refresh, I use the wet cleansing clothes with make- up remover and the lens wipes for my glasses. I always stock tissues, and ibuprofen.