First, the honest part
Let's get this out of the way. We have not bought these cases. We have not put a single machine inside a single case, and we are not going to pretend otherwise. This whole site is desk work: published numbers, checked against one simple rule, with the source named so you can check us. If we cannot tie a claim to a published number or a maker's compatibility list, it gets marked not confirmed. That is the deal.
The three labels
Named by the manufacturer This one is simple. A maker's chart, an official product page, or a specialist retailer's chart names your exact machine for that exact case. It is the strongest proof we publish, because it is not our opinion. The named rows here come from Tutto's own size chart, the Sewing Machines Plus compatibility chart, Singer's official bundle page, and Brother's official SASEB compatibility list.
Fits by verified dimensions Nobody names the pairing, so we do the math. The case's published inside measurements have to beat your machine on all three sides, length, depth, and height, with at least half an inch to spare on each. It is a useful answer and it is still math. Padding runs thicker on some cases, handles bump out, spool pins stick up. That is why the breathing room exists.
Not confirmed This label means the pairing gets talked about, or gets sold with soft language like fits most machines, but the numbers we would need are not published. Soft language never earns a fit label here. The Luxja standard bag is our standing example: the listing promises a lot, and its inside measurements fail all 10 machines in our first dataset.
The half inch rule
Here is the whole rule. The inside of the case has to measure at least your machine plus half an inch, on length, on depth, and on height. All three. One miss is a miss, even a miss by a tenth of an inch, because you buy a case once and a return costs you time and postage. The Brother XM2701 in the Singer hard case fails by exactly that tenth of an inch of height, and we list it as no fit rather than rounding in its favor. It felt harsh. We did it anyway.
And remember, the machine sizes are the machine body alone. Embroidery units, extension tables, and wide tables are not in these numbers. They travel separately. If you haul your machine with a table attached, these tables are not for you, and we would rather tell you that up front.
Sources
Machine sizes come from the makers' own specification pages where we could get them, Brother, Singer, Janome, and Juki, cross checked against retailer spec tables. Case insides come from Tutto's published size charts, Sewing Machines Plus product and chart pages, Singer's official hard case page, Everything Mary listings at the big retailers, BlueFig product pages at sewing shops, Janome dealer pages, and Brother's official SASEB page.
Where the published numbers fight each other
Tutto: the maker's own chart gives maximum machine sizes that are smaller than the insides its retailer publishes for the same cases. We used the retailer's inside figures for the math and the maker's chart for the named fits, and we tell you which is which wherever it matters.
Everything Mary: the XXL turns up with at least three different insides across resellers. We used the figure that showed up most often, and we flag the rows that come out tight.
Singer: the hard case page prints two different approximate sizes in its own text. We used the stated inside line, 18 by 9 by 12.5 inches.
BlueFig: the product pages never confirm whether the measurements are inside or outside, so every BlueFig fit from the numbers carries a little warning note. You will see it wherever BlueFig appears.
Sewing Machines Plus names the Brother CS7000X for the Tutto 2XL, a case far bigger than that machine needs. We print the naming because it is published, and we flag it as an oddity instead of a recommendation. Our math points that machine at the Tutto Medium, and so would we.
Corrections
Listings change. Sizes get edited, models get replaced, and sometimes we will just get a number wrong. If you own one of these machines or cases and your tape disagrees with a row here, we want to hear it. That kind of correction is gold to a site like this. A corrections address goes up when the site launches. Anything we fix will carry its source and the date it changed, and a row that loses its support moves to not confirmed. It does not quietly vanish.