The CAMO Tank from Alien Hydroponics is a collapsible water butt that features a strong perimeter frame.
The frame is made from steel tubes with alloy corners, the tank itself is constructed from tough PVC CAMO material and has a lid made from heat reflective Mylar which reduces the amount of heat transferred to your nutrient solution. The lid is secured in place with Velcro for easy access. 
Entry & exit holes are featured in the lid for pipes in & out. When not used a screwed on cap covers the hole. 
The thread for the tap is now locked in position from factory so no nut is required on the inside so leaking taps are a thing of the past.