I've used a standard stainless camp percolator for years with the only drawback of the coffee grounds almost always ending up in the bottom of my cup. Which isn't all that bad if you enjoy cowboy coffee.
This gadget takes just a little getting used to. At first it's just a little hard to insert and remove the press from the Nalgene the first few times you try it, but you soon figure out the procedure. After working the thing 5 or 6 times you'll have it down pat. Another thing to remember when useing the press is that it's designed to work with a bottle that has hot/warm water in it. you could probably damage the press if you try to push it down in a dry or cold bottle since lexan like vinyl will shrink somewhat when cold.
Now I'm a person who drinks coffee all day long so this thing will be great on trips. I tested it in the standard 32 oz. bottle and it worked fast and made good coffee and used less coffee grounds than needed for perc coffee. But I have two 48 oz thermos bottles that I fill in the morning when camping or canoe tripping so I dug out my extra long 48 oz Nalgene bottle, but the press won't work in this because the press handle is to short. So it was out to the shop to extend the press handle by drilling and tapping a piece of aluminum rod to make the handle exactly 4 inches longer. In about 20 minutes I was done and ready to test again. Results were perfect. Maybe Press-bot will someday offer an extended version but for now I'm happy. No more standing around making sure the coffee pot doesn't boil over.
Great product! And very well made.