Two 45 kg LPG (Liquified petroleum gas) cylinders in New Zealand. Other than this type cylinder there are auto lpg cylinders many different sizes and volumes.
<a href="//commons.wikimedia.org/wiki/User:Evil_Monkey" title="User:Evil Monkey">Evil Monkey</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>