Cali Oso

The Cali Oso is a pocket dry-herb vaporiser that gets the fundamentals right — precise temperature control, a chamber you can actually clean, and a shell that survives being dropped. The battery is the catch.

Most portable vaporisers make you choose between pocketable and capable. The Cali Oso lands closer to the first than almost anything else at this price, and gives up less than you’d expect for it.

Side by side with a standard lighter it’s barely taller and a little wider — genuinely a front-pocket device rather than a bag device. The shell is a soft-touch rubberised black with moulded grip ribs down both sides, and a small California bear embossed near the base. It doesn’t feel precious. Three weeks in, mine has been dropped twice onto a tiled floor with nothing to show for it.

The display earns its place

The OLED panel shows battery level, current temperature and target temperature at once, which sounds obvious until you’ve used the competition. Plenty of devices in this bracket give you three preset heat levels and a colour-changing LED, and leave you guessing at what’s actually happening in the chamber.

Here you set a target to the degree. Watching current temperature climb to meet the target — and seeing it sag when you draw hard — tells you more about how a session is going than any preset ever will. If you have opinions about where terpenes sit versus where cannabinoids do, this is the control you want.

Vapour is good, not great

At the low end, around 350°F, it produces thin, clean vapour with the flavour intact. Push past 400°F and you get visible clouds but the flavour flattens out, which is normal for conduction heating at this size.

It won’t match a desktop unit or a larger convection portable — that isn’t the comparison. Against other pocket devices it holds up well, and the single-degree control means you can find the spot you like and return to it exactly.

The chamber takes a modest amount of ground flower and packs easily. Cleaning is a cotton bud and some isopropyl, which is about as good as it gets in this category.

The battery is the real limitation

This is where the Cali Oso loses points, and it’s the thing to understand before buying.

A full charge gets through roughly three to four short sessions at middling temperatures, less if you run it hot. For a device built around being pocketable all day, that’s the wrong end of acceptable — and there’s no pass-through charging, so a flat battery means waiting rather than plugging in and carrying on.

The shell also gets warm near the mouthpiece during longer sessions. Not uncomfortable, but noticeable, and more so the harder you push the temperature.

Who it’s for

If you want precise temperature control in something that genuinely disappears into a pocket, and you’re the kind of user who has two or three short sessions a day rather than one long one, it’s an easy recommendation.

If you’re out all day without reliable charging, or you want sustained heavy use, the battery will frustrate you. There are larger devices at similar money that will serve you better, at the cost of carrying them.