As long as they don't freeze
When we lived in France, I had to change the tank for the heating oil. I thought I could use the old one to store water from the barn roof. I made a base in the barn, connected it all up and it filled very quickly, all 1500 litres.
This is the new oil tank and the base for the old one
View attachment 593825
A couple of years pass and we have a very cold winter.
I am outside when i hear a loud bang in the barn. I go and have a look and see this.
View attachment 593826
A 1500kg ice cube has decided to fall over and smash most of our garden furniture. The base of the tank curved as the water froze. It took about 2 weeks to thaw and drain away. Surprisingly there was only a tiny crack near the top, so I moved it outside, buried about a third, so it would not fall over again. (I seem to remember the temperature tha previous night was something like -15 deg C)