A liter is closer to the size of a Quart Baggie. It takes More than 1 liter to make a gallon. Is that what you need. Is this for your carry on liquids? because I think it is what will fit in a quart size bag per person or carry-on.
And in SOME airports a SMALLER bag will not pass. (Harry Potter has put a magic spell on quart size bags only. Either that or the folks that run the baggie companies whined to the TSA, we don't sell many quart size, make them use THOSE! Has anyone checked Kip Hawley's stock holdings?)