PlatypusGravity Works Universal Bottle Adapter

Using this with my MSR Dromedary Bag in conjunction with a gravity feed water filter (for camping). Fits perfect.

I attached this to my nalgene bottle and attached the small center piece. On one end of the center piece I put tubing to place in the bottle. The other end I attached tubing and a mouth piece and turned my nalgene water bottle into a hydration bladder which stays in my backpack side pocket. It works perfect. Next I will attach a sawyer filter to the tube. It works better than any system I have purchased. Now I won't have to stop hiking every time I need water and have to fight to reach my bottles.

I was going to use it for a 6 gallon clean water tank and a 2.5 gallon collapsible clean water tank however they both have the same opening and thread pattern and this doesn't work for them but overall it's a decent product. I ended up taping it on but will probably find a different option. Or a better way to stick it on there without having to use tape.

A little pricey but adds versatility to the Platypus Gravity Filter system. Lets it connect with other water containers.

I use this with my Katadyn Base Camp filter to fill nalgene bottles. The hose out of the base camp fits perfectly and securely. Probably the best aspect of the design of this adapter is that it allows air to escape, so your gravity filter will not stop filling. Sure, a little water may leak out the top, but that's not a problem worth worrying about in my book. Genius!One thing that does not show well in the pictures is the bottom side comes with a screw in cover that protects the output side of the adapter.And one more thing... the blue insert is removable, and stepped in varying sizes of diameter so that it could be used in a multitude of bottles.One small addition I would appreciate is a cover, or method of closing, for the input nipple. I would like to just toss it in the base camp bag (yes the part that hold the "dirty" water) and not have to thing about all the creepy-crawlies getting into the adapter. Just a small wish.