Gallon bottles of milk

Something I took photos of to share, right back when we first arrived: Gallon bottles of milk.
1Gallon = 3.78 L = huge bottles to store in the refrigerator. These bottles are pictured in-situ next to a 600mL bottle of water.
Milk does not go in the door of the fridge here (the 6 packs of beer do though). We buy 4 bottles of milk a week, so half a fridge shelf is taken up with milk.
You know how they always tell little children they can use an empty milk bottle to float with in water if they're in a sticky spot (near some milk bottles, obviously). I've always wondered about the quality of support given by a milk bottle. I suggest, making sure you have Gallon milk bottles nearby, because these would really float. Just a thought.