A million gallons is really a lot; I would say, an extra-large swimming pool could be large enough.
3.246753 gallons
Assuming it is a rectangle, 8.485 US gallons
74.42 gallons.
It depends how long it is.
A 25-acre pond that is uniformly 6 feet deep will hold about 48,877,714 gallons of water.
This container could hold up to 3,949.71 US gallons of water.
A 35,200 cubic foot container can hold up to 263,314.29 gallons.
That would depend on the size of the container.
If you mean inches, it can hold up to 6,739.95 gallons. If you mean feet, it can hold up to 11,646,630.24 gallons.
24,685.7 gallons.
If these dimensions are in feet then the volume would be about 101 US gallons.
19.64 US gallons.
10.38961 gallons (rounded)
To hold 550.0 gallons, you need a container with a volume of at least 550 gallons. Since there are 7.48 gallons in one cubic foot, the container would need to be approximately 73.5 cubic feet (550 ÷ 7.48). If you're considering the dimensions, a container that is 3 feet wide, 3 feet long, and about 6.1 feet high would suffice. Always consider a little extra capacity for overflow or expansion.
It will depend on what you are putting in it. Water weighs 8 lbs per gallon, so your container would hold 256 lbs of water. Dry materials will weigh less.
About 47.6 gallons
Figure the volume in cubic inches and divide by 277.4 to get the number of gallons the container will hold. This is A close approximate formular. Convert the gallons to pints or less if it is a small container.