Originally Posted by ob1coby
rectangular SunnyD jugs?
They have rounded corners but they have flat sides so they fit well in a cooler. You can put them upright or sideways. The first one I did ballooned up as the ice expanded, so I left a few inches of water out and pushed the sides in before sealing the cap and they came out square.
At my local grocery store they are the biggest one you can buy. Might be different if you shop at Costco or Sam's. The picture says they are a gallon, but they feel bigger then a gallon of milk for some reason.
Also, as BilloutWest said, Milk containers could still be contaminated with milk byproducts but the Sunny D is basically a nicer version of tang so they aren't as prone to "science projects". They do retain a bit of citrus flavor for a use or two, but its actually kind of nice.
I like that they have a nice big handle. I carried one up to Nankoweep that was half full of ice, since I can get a bit overheated, and the handle made it easy to carry.