What Makes or Breaks a Leather Bag: A Five-Point Inspection
Cut a bag open and the sales copy stops mattering. Whatever is inside is what was actually sold.
That is the method of Tanner Leatherstein, a TikTok creator who takes knives and seam rippers to handbags and briefcases on camera and scores them against a published checklist. FashionUnited reported in August 2025 that his following had passed two million. One of his videos opens with three wrong answers already crossed out, and a dare:
The caption reads: “It’s not the leather. Not the hardware. Not even the design.” It then says something else makes or breaks a bag, and asks viewers to guess. The answer is his to give, so the video is worth watching before reading further. This post works from the framework behind the question, because a framework can be carried into a shop and a video cannot.
Three answers already crossed out
Leatherstein publishes the checklist on his own site as five pillars: leather, hardware, craftsmanship, structure and design. Each is scored from one to five. His article treats them as equal parts of one star rating and does not rank any above the others.
The caption eliminates leather, hardware and design. Two pillars remain.
Craftsmanship, which his article defines as “how edges are finished, how stitching is applied, and how layers are assembled.” And structure: the engineering of the piece and the non-leather materials that hold it together.
Which of the two the video names, this post does not claim. Both can be checked by hand, on a briefcase, in a few minutes, and each pillar gets a section below.
Who is doing the scoring
Profiled by D Magazine in June 2024, Leatherstein had nearly a million TikTok followers and a first briefcase teardown that passed 800,000 views. The piece lists his tools as leather knives, seam rippers and acetone, which he uses to expose raw materials. His stated reason: “People like leather, but they don’t understand it enough to make comfortable choices.”
One piece of context belongs next to that. In 2025 he became director of craftsmanship and a shareholding partner at a handbag brand, Stow London, according to FashionUnited, so a commercial interest now sits beside the teardown videos. The pillars are published and can be checked independently of anyone’s verdict, which is the reason to work from them. His own briefcase design, cut open in a Lineapelle write-up, scored 4 out of 5 for leather and for craftsmanship, 3.5 for structure and 3 each for hardware and design. A scorecard that gives its own author a 3 is at least not flattering him.
Leather: look at the cut, not the surface
A finish can be applied to almost anything. A cut edge is harder to dress up. Full-grain leather shows dense fibre running through its thickness, while coated or layered material tends to show a flatter, paler or plastic-looking cross-section. Any place the hide is cut and left uncoated, such as a strap end or a seam allowance, gives a look.
English bridle leather is vegetable-tanned, a process covered here, and the line between full-grain, top-grain and “genuine” leather is spelled out here. Leatherstein’s route to the answer is more drastic. Acetone strips a finish and shows what lies beneath, which is a test for remnants and for bags already headed for a video, not for one meant to be carried to work.
On a new bridle leather briefcase the checks are quieter. An even, waxy feel with no tackiness. No cracking where a corner flexes. A cut edge that looks like leather.
Hardware: weight, and what shows when it scratches
His definition covers the metal, its coating and its design. Coating is the one to watch. Solid brass is brass all the way through, so a scratch shows more brass; plated hardware shows a different metal underneath once the plating wears. Why solid brass hardware outlasts the leather around it goes through the metallurgy.
In the hand, the tests are physical. Hardware should feel heavy for its size. A buckle tongue sits straight and does not bend under thumb pressure. Rivets sit flush, with no burr to catch a sleeve, and swivels turn without grit.
Craftsmanship: edges, stitches and the lining
Edges first. A finished edge is even in width and colour, smooth to a fingernail, and free of flaking at the corners, which are among the first places wear shows up.
Then the stitch line. Uneven stitch length, a line that wanders, and loose thread ends are the quick tells. Hand saddle stitching locks every stitch independently, which is why a single broken stitch does not run the length of a seam, as this comparison with machine lockstitch shows. A short TikTok from the maker Geoffrey Crofte (@lordleathercraft) on French-style saddle stitching answers questions his viewers asked, among them how to avoid piercing the thread:
Last, the lining, which is where cost-cutting hides because nobody photographs it. In an April 2025 report from The Root on a deconstructed counterfeit handbag, Leatherstein’s verdict on one component was blunt: “The inner lining is sloppy craftsmanship.” The outside had been copied well. The lining had not. Open a briefcase fully and look into the corners, at the seams and at the place where lining meets leather.
Structure: what holds the shape when nothing is in it
Structure gets the least attention in a showroom, because an empty bag on a shelf looks the same whether it is engineered or merely stiff.
Stand the briefcase empty on a flat surface. Then fill it with what actually gets carried and look again. A front panel that sags, sides that belly outward or a base that rounds under load all point to a shape borrowed from something other than the leather. The handle mounts take the whole load, so check how they are attached and whether the leather around them is reinforced. Leatherstein’s write-up of his own briefcase notes that it “doesn’t rely on synthetic reinforcements” and depends instead on the natural firmness of vegetable-tanned leather. How firm a given hide runs is part of the bridle versus harness comparison.
Design: the pillar that ties the others together
His article describes design as the guiding principle that “unites all other elements.” In practice it comes down to use. Does the case open wide enough to find things? Does the working load fit, down to a legal-size file? Does the handle suit the hand that will hold it for years?
The five checks on one page
The pillar definitions follow Leatherstein’s published article. The checks and red flags are editorial.
| Pillar | What it covers | Check in the hand | Red flag |
|---|---|---|---|
| Leather | Foundation material and durability | Dense fibre at a cut edge; even, waxy feel | Plastic-looking cross-section; peeling coat |
| Hardware | Metal, coating and design | Heavy; tongue straight; rivets flush | Flaking plating; rattle; burrs |
| Craftsmanship | Edges, stitching, layer assembly | Even edges; steady stitch length; tidy lining seams | Wandering stitch line; loose ends; edge paint cracking |
| Structure | Engineering and supporting materials | Stands empty; holds shape loaded; reinforced handle mounts | Sagging front; handle pulling at the body |
| Design | Originality and usability | Opens fully; fits the load; comfortable handle | Layout fights the contents |
What can be fixed later and what cannot
This section is editorial argument, not something from the video.
Leather changes with use and can be looked after. Scuffs and water marks have known remedies, conditioning follows a routine, and the darkening that comes with age is a record rather than a flaw. Hardware can usually be replaced by a competent repairer. Design is a matter of taste and fit.
The two pillars left standing by the caption behave differently. Edges, stitch lines, layered assembly and the internal engineering are fixed at the bench. A briefcase built thin cannot be thickened afterward, and a lining stitched badly is stitched badly for good.
Which of them the video calls the deciding factor is for the video to say.
Marcellino NY makes each briefcase to order in English bridle leather, with lead times that run to roughly six months, so the inspection happens through the commission rather than at a counter. The edges, the stitching and the lining are the parts to ask about, and What You’re Actually Commissioning When You Commission a Bag covers the rest of the process.
Questions people ask
What are the five pillars of leather quality?
On Leatherstein’s site: leather, hardware, craftsmanship, structure and design, each scored from one to five. It is one expert’s framework, not an industry standard.
Which pillar matters most?
His article does not say. It weighs all five equally in a single star rating. The TikTok caption implies a single factor that outweighs the rest and leaves the viewer to name it.
Can leather quality be tested at home?
Some checks are safe: the cut edge, the feel, the flex test at a corner, the weight of the hardware. The acetone test is another matter. D Magazine’s profile lists it among Leatherstein’s tools, and no source gathered for this article recommends it on a bag a person intends to keep.
Is TikTok a reliable guide to bag quality?
A teardown shows the inside of a bag, which a product page never will, and that is its value. Creators can also have commercial ties, as the disclosure above shows for this one. The sensible use of a video like this is as a prompt to run the checks personally.
Does a higher price mean better craftsmanship?
The framework scores the object and leaves the price tag out. FashionUnited quotes Leatherstein describing what he values in a brand as “excellent craftsmanship, quality materials, and honest pricing”, which treats price as a separate question from the pillars rather than a proxy for them. What a Leather Briefcase Costs Per Year of Use works through the price question in a different way.
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Sources
- TikTok, @tanner.leatherstein, video 7476531937440730414
- TikTok, @lordleathercraft, French-style saddle stitching, video 7208290868930153733
- Tanner Leatherstein, “How to Tell the Quality of a Leather Product”
- Tanner Leatherstein, “Live at Lineapelle: Cutting Open My Leather Briefcase”
- FashionUnited, “Stow London names TikTok’s Tanner Leatherstein as director of craftsmanship” (August 5, 2025)
- D Magazine, “The Thousand-Dollar Bag Destroyer” (June 18, 2024)
- The Root, “Leather Expert Deconstructs ‘The Perfect Fake Birkin’ Bag” (April 18, 2025)
