Evening Calm and Garden Bloom: ₹799 ÷ 7 = ₹114. ₹1,299 ÷ 16 = ₹81.
Mountain Breeze and Fresh Brew: ₹849 ÷ 7 = ₹121. ₹1,349 ÷ 16 = ₹84.
At the extremes: a Morning Freshness 130ml at its fastest is ₹89 a week; a 50ml at its slowest is ₹94. The two ranges never meet.
Below both: a 300ml refill is about ₹65 a week, a 500ml about ₹56.
2. About ₹78 a week for a 130ml. Morning Freshness at ₹1,249 over the middle of 14–18 weeks: ₹1,249 ÷ 16 = ₹78. Evening Calm and Garden Bloom at ₹1,299 give ₹81. Mountain Breeze and Fresh Brew at ₹1,349 give ₹84. The gap to the smaller bottle is between ₹29 and ₹37 a week depending on the scent — for Morning Freshness it is exactly ₹29.
3. The ranges settle the argument. A midpoint comparison invites the objection that your bottle might run fast or slow, so take the extremes instead. A Morning Freshness 130ml at its fastest — fourteen weeks — is ₹1,249 ÷ 14 = ₹89 a week. A 50ml at its slowest — eight weeks — is ₹749 ÷ 8 = ₹94. The unluckiest 130ml still beats the luckiest 50ml. That holds for all five scents.
4. Over a year it is about ₹1,500. Keeping one room scented for a year on 50ml bottles is about seven purchases: 7 × ₹749 = ₹5,243 for roughly 49 weeks. On 130ml it is three: 3 × ₹1,249 = ₹3,747 for roughly 48. That is ₹1,496 of difference for the same room and the same scent. On Mountain Breeze the gap is wider still — 7 × ₹849 = ₹5,943 against 3 × ₹1,349 = ₹4,047, a difference of ₹1,896.
5. And the 50ml still has two honest jobs. Trying a blend you have never smelled, where ₹749 is a sensible amount to risk against ₹1,249 and four months of regret. And small wet rooms — a bathroom under about 40 sq ft, where a 130ml on even three reeds is more liquid than the space will ever get through. The 50ml is the cheaper thing to buy and the dearer way to buy fragrance, and both halves of that sentence are true.
Made in India, composed by an ISIPCA Versailles-trained perfumer — and a portion of every order supports girl-child education through Nanhi Kali.
Why cost per week is the only comparison that tells you anything
Sticker price answers a different question from the one you are asking. ₹749 against ₹1,249 tells you what leaves your account today; it says nothing about what the room costs to keep scented, which is the thing you are actually buying. Cost per week of use is price divided by weeks, and it is the only figure that compares two sizes fairly — because the two sizes do not deliver the same product. A 50ml delivers seven weeks of a room. A 130ml delivers sixteen. Comparing their prices without dividing is like comparing a week's groceries with a month's and concluding the week is cheaper. Per millilitre the same story appears in a second way: ₹749 ÷ 50 = ₹14.98 a millilitre against ₹1,249 ÷ 130 = ₹9.61. You are paying for a glass bottle, a machined collar and six fibre reeds every time you buy the small size, and those cost roughly the same whichever volume they are wrapped around.
The honest caveat is that both numbers are ranges, not constants, and the range is wide enough to matter. A 50ml runs 6–8 weeks and a 130ml 14–18, which for Morning Freshness means anywhere from ₹94 to ₹125 a week for the small bottle and ₹69 to ₹89 for the large one. What decides where you land inside those ranges is mostly reed count, and after that heat and airflow. Six reeds in a hot west-facing hall will put you at the expensive end; four reeds in an air-conditioned bedroom will put you at the cheap end. That is why we publish ranges rather than a single confident number, and it is also the good news buried in this article: the figure is partly under your control, and moving it costs nothing. What you cannot do is move it far enough for the 50ml to beat the 130ml. Within any one scent, the two ranges do not overlap.
Three ways this figure gets used, and one way it gets misused
130mlFrom ₹1,249Five scents, two sizes, ten numbers. Morning Freshness ₹107 against ₹78. Evening Calm ₹114 against ₹81. Garden Bloom ₹114 against ₹81. Mountain Breeze ₹121 against ₹84. Fresh Brew ₹121 against ₹84. The 130ml wins by ₹29 to ₹37 a week in every single case. There is no scent where the small bottle is the better weekly buy, which is unusual — most ranges have at least one exception. This one does not.Sizing by space — the weekly figure for each kind of room
Every cost below is the real weekly figure for that space, derived from the price and the middle of the longevity range. One row costs nothing, because that space does not earn a bottle.
| Space | What it needs | How many | Cost |
|---|---|---|---|
| A bedroom or study kept scented all year ★ | One 130ml on four reeds — ₹1,249 ÷ 16 weeks, and four reeds pushes it towards ₹69 | One 130ml | from ₹1,249 · about ₹78 a week |
| A blend you have never smelled | One 50ml — the dearer week, bought deliberately, because ₹749 is the right amount to risk | One 50ml | from ₹749 · about ₹107 a week |
| A small bathroom under about 40 sq ft | One 50ml on two or three reeds — fewer reeds pushes ₹107 down towards ₹94 | One 50ml | from ₹749 · about ₹94–₹107 a week |
| Two rooms you keep scented all year | Two 130ml bottles, one per room — Morning Freshness and Evening Calm come to ₹2,548 | Two 130ml | ₹2,548 · about ₹80 a room-week |
| One room, same scent, glass already owned | A 300ml refill — 300ml is about 37 weeks, and ₹2,399 ÷ 37 is the lowest figure on this page | One 300ml refill | ₹2,399 · about ₹65 a week |
| A corridor, a landing, or a bedroom used twice a year | Nothing. Any cost per week divided by a room nobody occupies is the whole cost, not part of it | None | ₹0 |
| A note on all of the above: these weekly figures use the middle of each range — 7 weeks for a 50ml and 16 for a 130ml — on six reeds in a closed room of standard ceiling height. Fewer reeds moves every figure down and a hot, draughty room moves it up. | |||
One room · the unitFrom ₹749Shop → 
Two rooms · better value₹1,498Shop → 
Large room · a switch₹1,899Shop →
Reeds, heat, and the part of the figure you can actually move
Reed count is the largest single lever on your cost per week, and it is free. Six reeds is full strength and the fast end of the range; four is a bedroom setting and the slow end. A Morning Freshness 130ml on six reeds in a warm room lands near fourteen weeks, which is ₹89 a week. The same bottle on four reeds in an air-conditioned bedroom reaches eighteen, which is ₹69. That is a ₹20 a week swing from an adjustment that takes ten seconds and costs nothing. It is not free fragrance — you are asking for less scent per week and getting more weeks in exchange — but in a room you sleep in, four reeds is usually the level you wanted anyway. Before deciding a bottle is poor value, count the reeds in it.
Placement moves the figure almost as much as reed count does. Evaporation rises with heat and airflow, so the identical bottle behaves differently in different corners of the same flat. In the direct path of an AC vent or a ceiling fan it empties fast and pushes everything against one wall; in direct sunlight it both empties fast and fades. On a shelf near a doorway with gentle air movement it does its job at a sensible rate. A 130ml that lands at fourteen weeks in a hot hall will reach eighteen in a cool bedroom — same bottle, ₹89 a week against ₹69. Keep it off polished wood and out of reach of children and pets while you are at it, because reed oil marks a finish permanently.
Then, once you are committed, refills take the figure below any bottle. A 300ml refill at ₹2,399 is about 37 weeks in one room, which is roughly ₹65 a week; a 500ml at ₹3,499 is about 62 weeks, roughly ₹56. Both assume you already own the glass, since a refill contains no bottle, no collar and no reeds. That is the whole ladder in one line: ₹107 a week on 50ml bottles, ₹78 on 130ml, ₹65 on a 300ml refill, ₹56 on a 500ml — and every step down the ladder asks for more commitment to one scent and more money on the day.
What to buy
Ranked by cost per week rather than by price, which reverses the order most people expect. The cheapest thing to buy is the dearest way to buy it.
| Buy | What it covers | Lasts | Price |
|---|---|---|---|
| One 50ml | A single reed diffuser — about ₹107 a week — the dearest fragrance per week, and still right for testing a blend or a tiny bathroom | 6–8 weeks | from ₹749 |
| One 130ml ★ | The value size — about ₹78 a week — the cheapest bottle per week, and the size to standardise on | 14–18 weeks | from ₹1,249 |
| The duo | Day & Night duo — about ₹107 a room-week across two rooms, which is the price of solving both from today | 6–8 weeks each | ₹1,498 |
| Sukoon | 500ml ultrasonic — a room past about 200 sq ft, where cost per week is not the problem you have | Runs when you switch it on | ₹1,899 |
| 300ml refill | The running cost — about ₹65 a week — the lowest figure available, once you own the glass and know the scent | Roughly 2 × 130ml fills | ₹2,399 |
Versailles
I would rather you judged us on cost per week than on price, even though price is the flattering number. ₹749 divided by seven weeks is ₹107. ₹1,249 divided by sixteen is ₹78. The small bottle is the easier purchase and the more expensive habit, and I will not pretend those are the same thing.
The test I trust is the one at the edges. Take the 130ml at its fastest and the 50ml at its slowest — ₹89 a week against ₹94 for Morning Freshness. Even then the big bottle wins. When a comparison survives its own worst case, you can stop arguing about it.
What I do not want is for anyone to read a lower cost per week as a stronger product. It is not stronger. Both sizes hold a closed, still room of up to about 150 sq ft on six reeds, and if your room is larger than that, the cheaper week will not reach any further than the dearer one. Bigger buys weeks, not square feet. And if you want to lower the figure without spending anything, take two reeds out — that is worth more than switching scent to save ₹6. A portion of every order funds a girl's classroom through Nanhi Kali.
Frequently asked questions
- Two 50ml against one 130ml — the longevity version.
- When a refill starts paying — ₹65 a week, with conditions.
- What the duo really saves — ₹50, and why that is not the point.
- What ₹1,500 genuinely buys — one room properly, or two at once.
- Brand: the SOSA founder story.
SOSA products & prices (verified August 2026): Hotel Collection water-based ultrasonic diffuser fragrance 15ml ₹299 · 100ml ₹999 · 300ml ₹1,799 · Pack of 7 (15ml, all fragrances) ₹1,799; refills 100ml from ₹999. Seven scents: The Ritz-Carlton-inspired (white tea · bergamot · cedar), Westin-inspired (white tea · aloe · cedar), 1 Hotels-inspired (cedarwood · vetiver · green leaves), The St. Regis-inspired (amber · violet · woods), Shangri-La-inspired (jasmine · green tea · white tea), Four Seasons-inspired (citrus · floral · sandalwood), W Hotels-inspired (citrus · pepper · amber). Diffusers: Boond 300ml ₹899 · Sukoon 500ml ₹1,899 · Megh 6L ₹3,499. Water-based, phthalate-free, composed to IFRA standards for home diffusion; 3–6 drops per tank. Made in India, Pune. The Hotel Collection scents are SOSA's own interpretations inspired by the world's finest hotels; all hotel names are trademarks of their respective owners and are used only to describe the scent style — SOSA is an independent Indian fragrance house, not affiliated with or endorsed by any hotel brand. Prices and availability subject to change — see the live product pages.