Packing lotion for travel requires two different approaches based on your luggage. For carry-on bags, you must follow the TSA "3-1-1" rule: the lotion must be in a container of 3.4 ounces (100ml) or less, and all such containers must fit into one single quart-sized clear zip-top bag. Even if a 6-ounce bottle is nearly empty, it will be confiscated because the container size itself is the limit. For checked baggage, there are no size limits, so you can pack full-size bottles of lotion. To prevent a "messy explosion" due to cabin pressure changes, "pro" travelers suggest unscrewing the cap, placing a small piece of plastic wrap over the opening, and then screwing the cap back on to create an airtight seal. You should then place the bottle inside a waterproof bag (like a Ziploc) for extra security. If you are worried about weight, consider "solid lotion bars," which are exempt from the liquid rules entirely and are a popular, eco-friendly travel alternative in 2026.