can this hold a spare air bottle securely?
FRANKIE W I dont think so. I use it for my safety sausage and finger reel and it is a tight fit.
CHRISTOPHER B I use this pouch for my 6 cubic foot pony tank,fits perfect. Just be sure to secure the pouch opening securely as the pouch zips into the zeagle bc with the opening facing downwards.
PAUL F Although I have not used mine to do so it looks like it would easily hold a pony bottle no problem. The elastic closure would hoild the bottle in securely