Agree with above. I fly a lot too, about twice a month. Domestic and international.
Boxes must be carried with, you cannot checked with your baggage, as they considered them as external batteries.
Usually I check my liquid in my luggage, just make sure they are tightly closed, maybe wrap a scotch tape around to be on a safe side.
You can also carry liquid as with other liquid. In a bottle less than 100 ml. The total must not exceed 1,000 ml. Oh, BTW, they count the "container's quantity" not the actual quantity of the liquid inside. All bottles must be put inside a clear zip-lock bag.
abut, in the end, check with your airlines.
And also check with the latest laws, rules and regulations of the country you're flying to, including the transit. I've heard too many "confiscated items" that I don't want to happen to you or anyone here.
Have a safe and fun trip.
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