Looking for < 4" diameter backpack tank.

[Scouty]

I have a wall safe at my cabin and I would like to find a bottle to fit in it and to carry in my backpack. I've tested it with a strip of plywood that is 105mm wide. Door still closes and locks but has to flex slightly.

I'd like to stay smaller than that if possible.

I have found 2.0 liter tanks with an O.D. of 101mm. Should work but I'm curious if there is anything smaller?

Prefer a DOT tank I can have filled at SCUBA and paintball shops but am willing to consider non DOT as well.

 

[Long_Gun_Dallas]

There are 1.1 litre tanks but appear to be the same diameter. If you want slimmer, you can get a 700cc bottle, but they are quite long. 

 

[Scouty]

Thank you. I found a 1.1 liter tank on my phone as I was falling asleep last night that was 85mm OD. Not sure if it was DOT but that gets me closer.

How long are the 700cc bottles with a fill assembly? Only need approximate idea. Are any of them DOT?

 

[beerthief]

 http://www.airtanksforsale.com/ 

"Guppy" tank is 4 inch x 13 with reg fittings Backpack tanks

 

[Long_Gun_Dallas]

I recon a 700cc with valve would come in somewhere close to 20"

 

[Scouty]

The Guppy is 4.6", unfortunately. Anyone know what size their Minnow is?

 

[SqrlHntr]

First Strike makes a line of small cf bottles. I ha e one, 2” wide 10” long incl valve. More of a bottle gun tank but is dang near pocket friendly. 2 of those would fit in the wall safe easily.