The bottle you carried out here is warming up. There is a procedure for that.

The first warm weekends of spring send everyone outdoors: the park, the river, the boat, the campsite. The wine comes along; the fridge does not. The Handbook treats this the way pilots treat a warning light: not with panic, but with a protocol.

First proper warm Saturday of the season. A picnic rug in the park, the back of a boat, or a fold-out table at the campsite. The rosé came out of the fridge at home cold, but that was an hour and a car trip ago.

You open it and pour the first round. Everyone says something nice about it. Then the bottle goes down on the rug, the sun keeps working on it, and by the second glass someone asks the thing nobody wants to ask: "Is this still cold?"

Wine does not go warm all at once. It goes warm from the outside in, and faster than you think. A bottle is a thin glass wall with a lot of sun on it, and out here there is no fridge to put it back in.

• The esky. Works until it doesn't. By mid-afternoon it is a bag of cold water, the label has peeled off, and everything comes out wet and sandy. It also weighs more than the rest of the picnic.
• Ice slush in a plastic bag. The esky without the esky. Cold for a bit, then a puddle in the boot and a bottle you can't hold without a tea towel.
• The wet tea towel. Old bush trick: wrap the bottle, let the breeze do the work. It slows the warming a little on a dry day, and leaves you holding a wet tea towel.
• Buried in the sand, or dunked in the river. Cooler than the air, which is the only bar it clears. The Handbook has records of tide, ants, and one bottle that was never seen again.
• The freezer sleeve. Gel jacket from the drawer. It works on the outside of the glass, same side as the sun, and once the gel thaws it is a wet sock on a warm bottle.
• Ice in the glass. The Australian classic. Cold for a minute, then water in the wine, and the second glass tastes like it.
• "Drink it fast." The most common response on file. Warm rosé is a different drink, and you did not carry it all the way out here for that.

Every one of these works on the outside of the glass, gives up, or puts water in the wine. The wine, inconveniently, is on the inside, and it would like to stay wine.

The idea is simple: put the cold inside the bottle instead. Steel carries cold far better than glass does. A deeply frozen steel rod down the neck sits in direct contact with the wine, the full depth of the bottle, with no glass wall in the way.

And because the cold works from inside the bottle, there is nothing to carry but the bottle and the rod. No esky, no ice, no power point. That is the whole trick.

Leg 1 — Store

The Lindner & Co chiller is a rod of 304 food-grade stainless steel that lives in your freezer door. An hour in the freezer and it is ready, and since it just lives in there, it is frozen long before the picnic is planned.

Leg 2 — Pack and deploy

Take it straight from the freezer as you walk out the door — the less time it spends in the bag, the more cold it has to give. Open the bottle where you land (it fits standard 750 ml bottles, cork or screwcap) and slide the rod in. Straight from the freezer into the bottle, it brings the wine to serving temperature in 10 to 15 minutes, from the inside, right where the wine is.

Leg 3 — Hold

Then leave it in. It keeps the wine cold for up to three hours, and nothing melts into the wine. The built-in spout aerates each pour and doesn't dribble down the label, the stopper closes whatever is left, and the whole thing is dishwasher-safe when you get home.

The recommendation is simple: put one in the freezer before the first long weekend of spring, and the bottle stops being a problem you carry around. With Buy One, Get One Free, the second kit goes in the bag of the mate whose esky is a bag of water by three o'clock.