I'm sure everyone already knows this but if on a longer trip, to save your filter system from plugging up from repeated dirty sources, use a coffee filter and rubber band on the inlet if possible. These weigh nothing and filter out the larger junk so you won't have to field clean your filter. Shorter trips don't matter much since you can clean at home. Also if using a steripen, use the coffee filter to filter out the sediment and other junk. Of course you'll need two containers. Just a thought

I've only done this once but it worked pretty good. I use an MSR Miniworks filter.