I pack my liquids in a silicone travel bottle and then pack in a ziplock freezer bag as they are thicker. If you're taking full size liquids and checking your bag, then spin off the cap, place a bag over the threads and then put the cap on, finally place back in a ziplock bag.
What bag do you put toiletries in?
Choosing The Size Of Your Toiletry BagMany airports require liquids, gels, creams, pastes, and aerosol cans to be visible in a clear, quart-sized bag. Sure, a plastic sandwich bag will work in a pinch. But an average sandwich bag is smaller than one quart, meaning you won't have as much space for your liquids.