|The old style plastic funnel|
I have long used a small plastic funnel to capture a trickle of water for treating in the outdoors with my water purifier when backpacking. Many of the outside above ground water sources are small trickles, where water follows its path of least resistance while being drawn downhill by gravity. Perhaps you have some experience with this on your backpacking trips and like me, seek a better way.
|The new style of silicon collapsible funnel|