Nalgene

Works perfectly, don't get the reviews saying it doesn't fit.You don't need to push it all the way through, sit it at the lip and then close the lid. The lid pushes it as far as it needs to go.If you're constantly dealing with it popping into the bottle, you're pushing it too far in.

A simple product, done well. Means that Ice cubes in the nalgene don't disrupt the water flow. Also prevents splashing whilst drinking on the move/whilst being active!

I bought this addition for my nalgene bottle mainly because during my research a few people complained that it was difficult to drink from the mouth of the bottle without spilling the contents down your chin. Well this device definitely stops that and fits the bottle perfectly. However, since receiving the bottle I've not experienced any problems without using the easy sipper, but now I've bought it I use it because it wasn't cheap to buy.

A bit pricey for what it is (hence the four stars) but it does mean I can use my nalgene on the move without soaking myself!

Just sits in the top of your bottle to prevent your bottle from just tipping water on your face

Fits in my nalgene bottle perfectly. Does the job especially since i bring it wherever i go,I don't have problems like pouring water on myself while drinking in a moving car.

it's alright. but slips into the bottle way too easy. I think In the wilderness that would be a problem for me.

Good accessory.Does what it says -makes it easier to drink from wide mouth bottle.I use it with the 1.5 l bottle.