Streetwize 51 litre waterhog 51 litre waterhog the waterhog is a water carrier which gives a 50litre capacity making it the largest water carrier on the market it is manufactured from food grade polythene the waterhog comes complete with an easily attachable handle the waterhog has been developed and improved from the original waterhog and is of a robust design with large tyres giving greater ground clearance than before taking the drag out of fetching your water a must for every car