i can hold a 25l on top of the backpack with one finger anyone could do the same , i really can,t see the difference from my way to yours judging by your video , if you think its brilliant great , but i think carrying 25l cans takes up less room in the van than the bottles your using , what i mean is more volume of water over the area used in the van , space in my van is an issue so the tiny improvement in working method does,nt stack up for me regards alan