The stainless Nalgene/Guyot bottle does this.
I have seen those, but I have never used one. Mainly because I'm looking for more of a last ditch kind of thing that will hold some last ditch gear and boil water. The bottle I have seen seems to be larger than I want with no way of attaching it to a kydex sheath.
I want to be able to have one nice neat little package that's a knife, and a small kit that can come off the knife and go on my belt, in my pocket, around my shoulder or where ever, but it's always together with my knife. I'm not a fan of pockets for gear, because that's all they are is a nylon pocket and do nothing else.
I don't want something that's to big either or needs another pouch to carry it. Something around the 2"x7" which will boil about 12oz. of water would be great. That would be something that would hold about the same amount as about four Altoids tins stacked on top of each other. Have four attaching points, two on the top and two on the bottom to tie off to a kydex sheath.
Then those four points could have 550 run through them to make a couple loops to wear it on your belt. The top loops would also be used to hold it over a fire for water.
For ME, that's about all the room I need for the things I want to carry, plus be able to boil enough water with a small fire to make it worth while. I can easily carry a space blanket, a BIC, a plastic bag for water, and have most of the tube left over for anything else I want.
Mistwalker, I have made a few tubes like this out of copper pipe, SS milk line pipe, and aluminum, so I have learned to pack these as well. When packing a tube, do not pack it in layers. You will run out of space fast. Think of packing it more like a box of drinking straws and have your items be able to go from the bottom to the top. Like a fire straw, don't make four of them 2" long, make one that's 8" long. Your packet of peanut butter, don't fold it, lay it flat along the side of the tube wall, then your emergency drink mix stacked on top of the PB. Have those small tubes, fishing and matches, stack on top of each other as well.
When packing a tube, a vacuum sealer works great. You can make sealed pouches any size you want. I make pouches for pills that I want to take. I lay the pills end to end in a sealed pouch. The pouch is skinny and long and goes from the top to the bottom.
Another thing I did was I packed a GOOD Sawzall blade like this one, that cuts in both directions. Grind the end if it's too long to fit in your tube. I pack a wood screw to attach the blade to a wooden handle I can make out in the bush. I don't make spoons, but I do make handles for things like this. I can't see wasting space for a plasic handle when I can make a wooden one out in the bush, and sawzall blades are better and cheaper than any hand saw I have ever used. If you put two layers of duct tape over the teeth of the blade, you will be fine, at least I have been fine. Just make sure you pack something to turn the screw. I pack a small swiss tech tool. They are pliers, and two screwdrivers in one.
http://www.amazon.com/Skil-94100-05-Pruning-Reciprocating-Blades/dp/B000BMBPGU
I think you get the idea here of what I'm trying to say. This way of packing also makes it very easy to find what you need and get it without unpacking layer after layer of gear.
