Buying Guide
Do Dehumidifier Bags Work? Honest UK Review
Updated August 2026
You've seen them on Amazon — small bags or hanging sachets that claim to absorb moisture and stop damp. Do they actually work? The honest answer: yes, but only in small enclosed spaces. They are NOT a replacement for an electric dehumidifier in a room. Here's exactly when they work, when they don't, and when you're wasting your money.
Quick answer
Our top pick: ANSIO Hanging Dehumidifier Bags
£10 (4-pack) on Amazon
Dehumidifier bags work in: wardrobes (yes), cars (yes), boats (yes), drawers (yes). They DON'T work for: whole rooms (no), serious damp (no), condensation on windows (no — use a dehumidifier). Bags absorb 200-500ml over 4-6 weeks. An electric dehumidifier extracts 6-20 litres PER DAY.
Check Price on Amazon →How much moisture do dehumidifier bags actually absorb?
This is the number that settles the argument. Here is what each type genuinely collects, based on manufacturer capacity and real UK winter use.
| Product | Water collected | Over what period |
|---|---|---|
| 100g car bag (silica gel) | 30–50ml | 1–2 weeks |
| 500g hanging wardrobe bag | 200–350ml | 4–8 weeks |
| Refillable tub (AERO 360 type) | 400–500ml | 6–10 weeks |
| 12L electric dehumidifier | 6,000–12,000ml | Per day |
Read that last row again. A single day of running an electric dehumidifier removes more water than twenty hanging bags collect in two months. That is the whole story — bags are a maintenance tool for small sealed spaces, not a damp cure.
The products we recommend
ANSIO Hanging Wardrobe Dehumidifier Bags (4-Pack)
These are the bags that give the category its good reputation. Hung in a wardrobe, the collection chamber fills visibly over a month and the musty smell disappears. Use them where they belong and they are excellent value; hang them in a damp living room and you will be disappointed.
Pros
- Hangs on a rail — no shelf space needed
- Visible water collection chamber
- Lasts 4–8 weeks per bag
- Genuinely stops musty smells on clothes
Cons
- Single use — ongoing cost
- Brine is corrosive if it leaks
Who it's for: Wardrobes and cupboards against a cold external wall
Check Price on Amazon UK →VapourVanish Reusable Silica Gel Bags
If you have decided bags suit your situation, buy reusable ones. Same effect in a small space, no waste, and after the first month they cost nothing. The colour indicator takes the guesswork out of when to recharge.
Pros
- Microwave to recharge — hundreds of reuses
- Colour indicator shows when saturated
- No brine, nothing to spill
- Zero ongoing cost
Cons
- Lower peak absorption than calcium chloride
- Needs a microwave
Who it's for: Cars, drawers, caravans and anyone tired of buying replacements
Check Price on Amazon UK →Devola 12L Compressor Dehumidifier
The honest recommendation for anyone with real damp. If bags have not fixed your problem after a month, it is because the problem is a room-scale one. A 12L unit ends window condensation in a couple of days and holds the house at a healthy 50% RH.
Pros
- Removes up to 12 litres per day
- Humidistat holds the room at a set humidity
- Fixes window condensation and wall mould
- Costs roughly 5–8p per hour to run
Cons
- Big upfront cost versus a £2 bag
- Needs a socket and emptying
Who it's for: Actual damp — running windows, mould patches, drying laundry indoors
Check Price on Amazon UK →ThermoPro Digital Hygrometer
Spend £10 here before spending anything else. Under 60% RH and bags are all you need. Consistently over 65% RH and no number of bags will help — that reading means an electric dehumidifier.
Pros
- Tells you whether you have a damp problem at all
- Tracks 24-hour high and low readings
- Cheap enough to buy one per room
Cons
- Does not remove moisture itself
Who it's for: Deciding between a £2 bag and a £95 dehumidifier
Check Price on Amazon UK →Where dehumidifier bags genuinely work
- Wardrobes — small sealed volume, no fresh moisture coming in. Bags stop the musty smell and mildew spots on stored clothes.
- Cars — a dashboard bag noticeably reduces morning windscreen fogging through a wet UK winter.
- Caravans, motorhomes and boats — especially over winter storage when nothing is heated or ventilated.
- Drawers, safes, tool boxes and camera bags — protects metal from rust and lenses from fungus.
- Under-stairs cupboards and meter boxes — tiny unventilated spaces where a bag is genuinely proportionate.
Where dehumidifier bags do NOT work
- Whole rooms — a bedroom holds far more air than a bag can influence, and every breath, shower and kettle adds moisture faster than it absorbs.
- Window condensation — you would need dozens of bags to match one night of moisture on the glass. Use thermal curtains and a dehumidifier instead.
- Rising or penetrating damp — that is water coming through the structure. No absorber will keep up; the building needs fixing.
- Drying laundry indoors — a load of washing releases 2 litres of water. A bag absorbs 300ml over six weeks.
- Existing black mould on walls — bags do nothing to the mould itself and won't lower room humidity enough to stop it returning.
Dehumidifier bags vs an electric dehumidifier
| Factor | Dehumidifier bags | Electric dehumidifier |
|---|---|---|
| Upfront cost | £2–£12 | £90–£200 |
| Running cost | £1–£3 per refill | Approx. 5–8p per hour |
| Water removed | 200–500ml per 4–6 weeks | 6–20 litres per day |
| Stops window condensation | No | Yes |
| Dries laundry indoors | No | Yes |
| Needs power | No — works in cars and storage | Yes |
| Best for | Wardrobes, cars, drawers, caravans | Rooms, flats, real damp and mould |
When to upgrade from bags to an electric dehumidifier
Three signs bags will never be enough
Upgrade if any of these are true: your hygrometer reads above 65% RH for days at a time, you wipe water off windows most mornings through winter, or you have visible black mould returning after you clean it. Each of those means moisture is being produced at room scale, which no absorber can keep pace with.
A 12L unit costs roughly 5–8p an hour and typically runs 3–5 hours a day once the house has dried out — under £5 a month. That is comparable to buying replacement bags every few weeks, and it actually solves the problem.
Tip
The sensible combination
Most UK homes end up with both. An electric dehumidifier handles the living space, while a couple of cheap bags sit in the wardrobe, the car and the under-stairs cupboard where a plug socket isn't practical. Around £110 total, and you never think about damp again.
Warning
Don't buy bags to fix structural damp
If damp appears as a tide mark low on a wall, a spreading patch after rain, or crumbling plaster, that is rising or penetrating damp. Bags, dehumidifiers and ventilation all treat the symptom. The building needs repair — and if you rent, your landlord is legally responsible for it.
Frequently asked questions
Bundle
The Honest Damp Kit — Diagnose first, then buy the right thing
- ThermoPro hygrometer (diagnose)£10Amazon →
- ANSIO bags (wardrobes)£10Amazon →
- VapourVanish reusable bags (car)£10Amazon →
- Devola 12L dehumidifier (rooms)£95Amazon →