After looking at several options for large amounts of emergency water storage, my work opted for Water Bricks. Mostly because of how stackable they are and that they are a little easier to carry than five-gallon containers.
I got to check them out when doing a demo of some of our emergency water treatment equipment. Big opening; easy to fill. Handle doesn't seem that beefy, but it's just 3.5 gallons. Nest GREAT. Plastic is perceptibly thinner than the LCI 5-gallon jugs (Scepter).
If you have a big enough cooler and a big enough freezer, you can make a honking big ice cube that won't get your cooler contents wet as it melts.
I still like the LCI jugs.
My name isn't actually Will.
I live in the Willamette Valley about a half mile from the Willamette River.