Stash & storage
by RAW
The RAW Hydrostone is a reusable baked terracotta clay disc that regulates humidity inside your stash jar. Dry, crumbly herb burns too fast, tastes harsh, and crumbles through your fingers when you try to roll. This little stone — developed and tested in collaboration with one of Europe's leading tobacco factories — addresses that problem with a single purchase. Soak it, drop it in your jar, and your cannabis stays at the moisture level that actually makes it pleasant to smoke. You can order the RAW Hydrostone once and never buy a humidity product again.
| Spec | Value |
|---|---|
| Brand | RAW |
| Material | Baked terracotta clay |
| Shape | Small disc / stone |
| Activation time | 5 minutes in clean water |
| Reusable | Yes — indefinitely |
| SKU | HS0507 |
| Quantity | 1 per box |
| Development | Tested with a leading European tobacco factory |
| Feature | RAW Hydrostone | Boveda 62% Pack | Integra Boost |
|---|---|---|---|
| Material | Baked terracotta clay | Salt solution in membrane | Salt solution in membrane |
| Reusable | Yes — indefinitely | No — lasts 2–4 months | No — lasts 2–4 months |
| Precision | General humidification | Maintains 62% RH | Maintains 55% or 62% RH |
| Recurring cost | None | Replacement packs | Replacement packs |
| Waste | Zero | Plastic membrane discarded | Plastic membrane discarded |
| Best for | Personal stash jars, daily use | Long-term curing, precise storage | Long-term curing, precise storage |
Complete your storage setup: pair the RAW Hydrostone with an airtight stash jar like the Infinity Jar or a TightVac container. The stone handles humidity, but it works best inside a properly sealed vessel that keeps air exchange to a minimum. If you're rolling what you store, a RAW rolling tray and RAW Classic papers round out the kit nicely. For grinding before you roll, the SLX Grinder or Santa Cruz Shredder both pair well with freshly humidified herb.
Cannabis loses moisture and terpenes within days of being stored in a non-humidified container, which is why the RAW Hydrostone exists. Leave a jar cracked open overnight, store it somewhere warm, or just let it sit for a couple of weeks, and you'll notice the difference. The buds feel lighter, they crumble instead of breaking apart cleanly, and when you smoke them, the flavour is flat and the burn is harsh. Terpenes — the compounds responsible for aroma and taste — evaporate as moisture drops. According to research referenced by the European Monitoring Centre for Drugs and Drug Addiction (EMCDDA), cannabinoid and terpene degradation accelerates in low-humidity environments, which is precisely what makes proper storage essential. Once those volatile compounds are gone, they're gone.
We've had customers bring in bone-dry herb that looked fine but smoked like cardboard. The solution isn't complicated, and it doesn't require expensive humidity packs that you throw away every few weeks. The RAW Hydrostone is a one-time buy. Terracotta is a porous ceramic — it absorbs water during the soak and then slowly releases moisture into the surrounding air inside your jar. It's the same principle behind terracotta plant pots keeping soil moist. RAW just scaled it down to stash-jar size and had it tested alongside tobacco humidity standards in a proper European facility.
One honest limitation: the Hydrostone doesn't come with a humidity gauge, so you can't dial in an exact relative humidity the way you would with a Boveda pack and a hygrometer. It's less precise but far more sustainable — no plastic waste, no recurring cost, and for most people keeping a personal stash fresh, it does the job brilliantly. If you're curing large quantities or storing for months, a two-way humidity pack might serve you better. For daily or weekly use? Get the RAW Hydrostone — it's the move.
The RAW Hydrostone is a lightweight, rough-textured terracotta disc about the diameter of a large coin that releases absorbed water slowly into a sealed container. Pick it up dry and it feels like a small coaster — warm orange-brown colour, weighing almost nothing. After 5 minutes submerged in water, it's noticeably heavier and the surface darkens as the pores fill up. There's no chemical smell, no residue, nothing that transfers to your herb. It's just clay and water. That simplicity is what makes it reusable indefinitely — there's nothing to degrade or expire.
Compared to single-use humidity packs (like Boveda 62% or Integra Boost), the RAW Hydrostone trades precision for longevity. A Boveda pack maintains a specific relative humidity percentage and lasts 2–4 months before it dries out and needs replacing. The Hydrostone doesn't target a specific percentage — it simply adds moisture back into the environment inside your jar. For a stash you're dipping into regularly, that's more than enough to keep things fresh. And you'll never need to buy another one.
Using the RAW Hydrostone takes about five minutes of preparation and then works passively for one to two weeks per soak.
Watch out for one thing: don't leave the stone in a sealed jar for weeks without checking. Over-humidification can encourage mould, especially in warm environments. If your herb feels damp rather than just supple, remove the stone and leave the jar open for an hour. This is rare with a single stone in a standard-sized jar, but worth knowing.
The RAW Hydrostone is one of the most reliably repurchased accessories at our Amsterdam counter — not because it breaks, but because customers buy extras for every jar they own. We've sold these for years and the feedback is consistently the same: people are surprised something this simple works this well. The most common question we get is "how long does it last?" — and the answer is forever, essentially. Terracotta doesn't break down. As long as you don't drop it on a tile floor and shatter it, you'll have this stone longer than any jar you put it in. One customer told us he'd been using the same Hydrostone for over 3 years. That tracks.
The second most common question: "does it make my herb smell like clay?" No. Baked terracotta is odourless once fired. Your terpene profile stays intact — in fact, it stays intact better than it would without the stone, because the moisture helps preserve those volatile compounds instead of letting them evaporate into dry air. If you want to buy a RAW Hydrostone alongside a proper airtight jar, we'd point you toward the Infinity Jar for UV protection or a simple Kilner clip-top jar if you prefer glass on a budget.
Every 1–2 weeks for a jar you open daily. If the jar stays sealed, the stone holds moisture longer — sometimes 3–4 weeks. Just re-soak for 5 minutes when your herb starts feeling dry again.
It's unlikely with normal use, but possible if you leave a freshly soaked stone in a very small, tightly sealed container for weeks without opening it. Check your stash periodically. If it feels damp, remove the stone and air the jar out briefly.
Yes. RAW developed and tested it alongside one of Europe's leading tobacco factories specifically for this dual purpose. It keeps rolling tobacco supple and prevents it from drying into dust at the bottom of your pouch.
Boveda packs maintain a precise relative humidity (typically 58% or 62%) and are disposable — they last 2–4 months. The RAW Hydrostone is less precise but 100% reusable and costs nothing to maintain. For personal stash jars, the Hydrostone is the more practical and sustainable option.
It fits any standard stash jar, mason jar, or airtight container. The disc is small — roughly the diameter of a large coin. One stone is enough for jars up to about 500ml. For larger containers, you could use two.
Yes. Rinse it under warm water and let it air-dry completely before the next soak. Don't use soap — terracotta is porous and could absorb detergent residue. A simple water rinse is all it needs.
No. Baked terracotta doesn't degrade with use. As long as you don't physically break it, the Hydrostone lasts indefinitely. There's nothing to replace or refill — just re-soak and reuse.
Last updated: April 2026
