I started using the Katadyn BeFree water bottle with filter this summer while bighorn sheep scouting and really liked it. It filters super fast, doesn't clog, and virtually doesn't add any more weight to my pack. The bag with the attached filter is actually less weight and bulk as Nalgene bottles. It also saves having to haul water around if water sources are available....merely fill up the bottle and drink as you need water. Another advantage would be that it filters out any debris or mucky water.
I have the classic model, does great on batteries, been using it for 3 years.. I'll probably start pre filtering though, last season we had red little swimming things in there and my wife wasn't to fond of that lol
Been using one of one type or another for 7 years or so. No complaints. I use a 1 micron diesel filter / sump sock as a scoop/prefilter works awesome and weighs nothing after cutting and removing the metal ring
Sumpsock | Polyester Felt Filter Sock | 1 Micron Rated | Signed for Strength | Aquariums, Koi Ponds, Pools, Reef Tank | 4" x 8-1/2" Size https://www.amazon.com/dp/B079HD777W/ref=cm_sw_r_cp_api_i_5IFuEbHQTYT8X