I Want a Candle Jar I Can Reorder for Years — What Should I Ask the Supplier Before Building My Entire Product Line Around One Container?

The twelve questions, and what a good answer sounds like

Send these before your first bulk order, by message or email so the answers are dated and on record. No supplier can promise a jar forever, and a good one will say so. What you are looking for is specific, honest answers; what you should worry about is vagueness on the questions that matter most to you.

Two notes on reading the answers. First, a "no" can be a good answer. "We don't have inside dimensions; please measure samples" is more useful than a confident figure that turns out to be the outside. Second, the continuity questions (1 to 3) matter more the more of your range sits on one jar. If one jar carries every product, a vague answer to question 3 is one of the biggest risks in your business, and it is worth planning for directly: the discontinuation-protection guide sets out the continuity plan (second-source qualification, safety stock, designing around common diameters). Questions to ask before your very first wholesale order more generally are in the 30-to-500 wholesale checklist.

What a listing can tell you before you ask

Before you send the questions, read the listing and its sister listings for signals. None is proof; each is a reason to ask a sharper question. Our own listings are the most honest examples we can give, so here are five, as they stood on 26 September 2026.

The last row is the point. On 26 September 2026, 20 of CSI's 72 container listings (28%) were out of stock, including the Glass Jar With Bamboo Lid, the Amber Glass Jar with Bamboo Lid, the White Iridescent 300 g bamboo-lid jar, and the 250 g and 300 g borosilicate jars (the Green Iridescent 300 g bamboo-lid jar and the 600 g borosilicate were in stock). We are not telling you whether those will return; we are telling you that containers go out of stock, ours included, and that a range built on one jar should be built with that in mind. A jar whose shape exists in several colour listings, several of them in stock, is a better starting signal than a single listing, but it is still only a signal.

Your own spec sheet: the document the supplier won't write for you

A spec sheet is a single page that defines "this jar" in numbers you measured, plus the band each number may move within before you treat a delivery as a different jar. The measurements themselves, and how to take each, are set out in the bulk measurement checklist; the bands come from your own burn tests, not from us. Here is what the sheet should hold.

Send a copy to the supplier. Some will confirm or correct it, which is useful in itself; either way, the next time you reorder you can say "same as the jar on this sheet", and mean something measurable. If a supplier offers you inside dimensions, a tolerance or a spec sheet of their own, file it alongside yours and check it against your measurements; a published figure is still worth verifying on your own jars. Ask us for anything we can add for the CSI jar you choose.

What to keep, and why six jars

Keep six unpoured jars from the first lot, with their lids, labelled "REFERENCE, do not pour", boxed and stored somewhere cool and dry where they won't be borrowed on a busy day. Six is our judgement, not a rule: three to compare against future lots (so one breaking doesn't leave you with nothing), and three to burn side by side with a future lot if you ever need to prove a difference. In the Clear 150 g jar that costs ₹566.40; in the White Matte, ₹424.80.

It is a small cost against what it protects: 1.2% of a single 500-jar reorder (₹47,200.00) in our Clear 150 g example. The same record is what the incoming checks in the jar QC checklist compare against, so the effort serves both.

Every reorder: the ten-minute comparison

The routine below takes about ten minutes per reorder (our estimate) and catches a changed jar before a whole lot goes into production. It is not a full QC pass; it is the continuity check that sits on top of it.

If a lot comes in different, the sort-and-test approach for a delivery with mixed diameters is in the 500-jar diameter guide, and what batch-to-batch variation does to wick testing over time is in the batch-variation guide.

Red flags in the answers, and what to do about them

Every one of these appears somewhere on our own listings, as the table in the listings section shows, which is exactly why we recommend the questions and the records for any supplier. The response to a red flag is rarely "switch now". Usually it is "keep more references, hold a little more stock, and have a second jar measured and tested before you need it". That second-jar work, and how to size a last-time buy when notice does come, belong to the continuity plan in the discontinuation-protection guide; if stockouts are already frequent, the frequent-stockouts guide weighs holding months of stock against qualifying a second supplier.

Jars with the most to go on

No CSI jar comes with a continuity promise, so these are ranked on what their listings give you to build a spec sheet from (stated dimensions, a stated heat figure, a sister family in stock) and on price. Everything below was in stock on 26 September 2026; per-jar figures are pack price ÷ units.

Frequently asked questions