Small, water-resistant tubes have been used for years as containers for small survival/E&E kits. The tube form factor makes them easy to stow just about anywhere discreetly. They are often made from machined aluminum or titanium which makes them fairly expensive. OscarDelta developed a solution that capitalizes on the proven tube form factor but that is significantly less expensive. They call them Go Tubes and Deep Carry Tubes.
Both models feature tubular PVC plastic construction with rubber end caps. The Go Tube has a ringed end cap that offers additional carrying options while the Deep Carry Tube has two flush end caps that make it more easily stash-able. These are small enough to be discreet and large enough to carry things like lock bypass tools, compact fishing kits, fire starting materials, emergency cash, or just about anything else that will fit.
Get your own OscarDelta Go Tubes or Deep Carry Tubes from Vigilant Gear.
I’ve spent a lot of time in professional kitchens, and those rubber end caps are 100% identical to those found on mop and broom handles. The little bump in the center is a dead giveaway, and as I check the link, so is the looped one. So what you have there is a section of PVC pipe and some mop handle ends, which seems like an easy DIY. I was all prepared to be indignant about it, but when I clicked on the link, the price point is actually pretty reasonable, considering the hassle it would take to source the rubber parts yourself. The concept is solid and clever, and if you wanted one or two, I would consider ordering them. But if you wanted more than that, I would just track down a supplier for the ends, and figure out what schedule of pipe they fit on, buy a few feet and a black rattle can, and have the advantage of custom lengths.
That was my thought as well. I could obviously make something like this but given the very inexpensive price, I would much rather not spend my time sourcing the parts.