Most leather bag startups fail before they even start.
Why?
Because they send the factory a “sketch” instead of a Tech Pack.
Here is the truth:
A sketch is just a pretty picture. A Tech Pack is a contract.
If you send us a sketch, we have to guess. And in manufacturing, guessing gets expensive fast.
Today I’m going to show you exactly how to build leather bag tech packs that factories (like us here at Milo Leather) love.
The best part?
This is the exact same framework used by the brands we work with that scale from 0 to 10,000 units.
In this guide, you’ll learn the 7 essential components of a production-ready Tech Pack.
Let’s dive right in.
What is a Tech Pack (And Why Should You Care?)
A Tech Pack is a comprehensive document that contains every single technical detail required to manufacture your bag. [1][3][4][5][7]Think of it as an instruction manual or a contract between you and the factory.
While a fashion sketch conveys the mood and aesthetic of the bag, the tech pack conveys the engineering. It answers questions like:
- What is the exact thickness of the leather?
- What type of interfacing is used to give the bag structure?
- How many stitches per inch (SPI) should be used?
- Is the edge finish painted or folded?
For leather goods, the tech pack is even more critical than for apparel. Leather is expensive and unforgiving; unlike fabric, you cannot simply “un-stitch” a mistake without leaving permanent needle holes. Precision is paramount.
Why is this important?
Without it, your “Cognac” leather becomes “Orange.”
And your “Gold” hardware looks like “Brass.”
(I have seen this happen more times than I can count).
The benefit of getting this right is massive:
A great Tech Pack = Zero miscommunication + Faster sampling + Lower costs.
If you want your sample to look exactly like your vision on the first try, you need this.
The 7 Pillars of a Perfect Leather Bag Tech Pack
To create a professional standard tech pack, you need more than just a list of materials.[1][2][3][4][6][7] Here are the core components you must include.
Pillar #1: The Technical Sketch (The “Flat Lays”)
Forget artistic illustrations. You need CAD (Computer-Aided Design) flat sketches created in software like Adobe Illustrator.
- Views: Include Front, Back, Side (Gusset), Bottom, and Top views.
- Interior: Never forget the inside! Show the lining, internal pockets, zipper placements, and brand tags.[1][2][4]
- Zoom-Ins: Create close-up views of complex details, such as how a handle attaches to the body or how a buckle is secured.
Most people make a rookie mistake here:
They only show the front of the bag.
Don’t do that.
You need the “Trinity”: Front, Back, and Side views.
Actionable Tip:
Include “Callouts” for every seam, pocket, and zipper. Point to the specific area and label it.
Pillar #2: The Bill of Materials (BOM)
The BOM is the shopping list for your factory. For a leather bag, this is complex. It should list:
Thread: Specify the thread weight (e.g., #40, #20 bonded nylon) and color.
Shell Material: Specify the leather type (e.g., Full Grain Cowhide), the finish (e.g., Pebbled, Smooth, Embossed Croco), and the thickness (oz or mm).
Lining: Material type (e.g., Cotton Twill, Microsuede, Pig Skin) and color code (Pantone).
Hardware: List every D-ring, O-ring, zipper, rivet, and magnet.[7] Include the metal finish (e.g., Antique Brass, Gold Plated, Gunmetal).
Pro Tip: Specify the exact leather thickness.
Don’t just say “leather.” Say “Top Grain Cowhide, 1.2mm – 1.4mm thickness.”
If you leave the thickness to chance, your bag might end up too floppy or too stiff.
Pillar #3: Construction Details
This is where many designers fail. You must tell the factory how to build the bag.[3][5]
- Stitching: Define the Stitch per Inch (SPI). For luxury leather goods, a higher SPI (like 8-10) looks more refined, while a lower SPI (5-6) looks more rugged.
- Edge Finishing: This is vital for leather. Do you want Inking/Edge Paint (common in luxury bags), Burnishing (for veg-tan leather), or Turned Edges (leather folded over)?
- Reinforcement: Leather skins are often floppy. You must specify where to add “interfacing” or “stiffener” (like Salpa or Eva foam) to give the bag structure.
Pillar #4: The Color & Material (C&M) Page
Here is the deal:
“Blue” is an opinion. “Pantone 19-4052 TCX” is a fact.
The Standard:
Always use Pantone codes for your leather and lining colors.
At Milo Leather, we match your Pantone code to the closest available leather skin or dye it specifically for you. But we need that code to get started.
Pillar #5: Measurements and Specs
You need to list the Height, width, depth, handle drop, strap length (min/max), and pocket openings.
But don’t forget the “Drop Length“ for handles.
(This is the distance from the top of the handle to the top of the bag).
Tolerance:
Tell the factory your “Tolerance” (e.g., +/- 0.5cm).
It shows you’re a pro. Leather is a natural material that stretches, so zero tolerance is impossible. Setting a standard of +/- 0.5cm keeps everyone on the same page.
Pillar #6: Branding & Logo Placement
Where does your logo go?
Don’t just say “on the front.”
The Method:
Do you want it Embossed? Debossed? Foil stamped? Screen printed?
The Position:
Use “X” and “Y” coordinates from the nearest seam.
- Example: “Center logo 4cm down from top seam (Y) and centered horizontally (X).”
Pillar #7: Packaging Instructions
This is the most overlooked step.
The Finish:
Dust bags, hangtags, and silica gel.
If it’s not in the Tech Pack, it won’t be in the box.
If you are an electronic brand looking for premium leather packaging, this is crucial for the unboxing experience.
Bounus Pillar:The Hardware Sheet
Hardware can make or break a luxury bag.
Every rivet, buckle, and zipper pull needs a photo and a specific finish.
You must specify:
The Brand: Mention specific brands if you have a preference (like YKK or Riri).
The Finish: (e.g., Brushed Gold vs. Shiny Gold).
Section 3: The “Factory Secret” (Bonus Tip)
Want to know an insider secret?
Include a “Reference Sample” photo.
Words are great. But visuals are better.
The Explanation:
If you like the stitching on a vintage Coach bag, take a photo and put it in the Tech Pack.
If you like the edge paint on a specific wallet, snap a picture.
Visuals beat words every time. It gives our craftsmen in Guangzhou a concrete target to hit.
Leather-Specific Details You Cannot Ignore
If you use a generic “backpack tech pack” template found online, it will lack the specific fields needed for leather manufacturing. Ensure you add these leather-specific sections:
The “Skiving” Instructions
Skiving is the process of shaving down the thickness of the leather at the edges so it can be folded or stitched without becoming too bulky.
- Tech Pack Tip: Use a color-coded line on your sketches to indicate where skiving is needed (usually 10-15mm from the edge) and what the final edge thickness should be (e.g., “Skive edge to 0.8mm”).
Leather Grading and Temper
Simply saying “Cow Leather” is not enough.
- Temper: Is the leather soft and slouchy (soft temper) or stiff and structured (hard temper)?
- Grade: Are you using Top Grain, Full Grain, or Genuine Leather?
- Tannage: Vegetable Tanned (patinas over time, harder) vs. Chrome Tanned (softer, water-resistant, holds color well).
Hardware Plating & Quality
Hardware on leather bags bears a lot of weight. Specify that hardware must be “Zamak” or solid brass if you want luxury weight, or iron/alloy for lower cost. Always specify “Rack Plating” (higher quality, smoother) vs. “Barrel Plating” (cheaper, prone to scratching) for your buckles and clips.
Tools of the Trade: How to Create Your Tech Pack
You do not necessarily need expensive software to start, but using the right tools helps.
- Adobe Illustrator: The industry standard for creating accurate vector technical sketches.
- Excel / Google Sheets: Perfect for the Bill of Materials and Measurement charts.
- Techpacker / PLM Software: Dedicated platforms that combine sketches and data.
Should you hire a professional?
If you are not comfortable with CAD or technical specs, it is highly recommended to hire a technical designer. Alternatively, some full-service manufacturers (like Milo Leather) can help review your rough concepts and professionalize them for production.
Common Mistakes That Ruin Leather Bag Production
Even with a tech pack, things can go wrong if you aren’t careful. Here are the most common pitfalls we see at Milo Leather:
1. Ignoring “Hardware Molds”
If you design a custom-shaped zipper puller or logo plate, the factory has to create a new mold. This costs money (500+) and takes time.
- Solution: Ask your factory for their catalog of “open mold” hardware to save costs, or budget specifically for custom hardware molds in your tech pack.
2. Forgetting Internal Structure
A bag might look great in a drawing, but if you don’t specify the internal reinforcement (Salpa, foam, card), it will collapse and look like a deflated balloon when sitting on a shelf.
- Solution: Include a “Reinforcement Map” layer in your tech pack showing exactly where stiffeners go.
3. Vague Color References
“Brown” is not a color. Leather dyes vary wildly.
- Solution: Always provide a Pantone (TPX/TCX) code, or better yet, send a physical swatch of a leather color you want to match.
How Milo Leather Uses Your Tech Pack
At Milo Leather, your tech pack is the primary document used by our sample room masters. Here is our process:
- Review: We analyze your tech pack for “manufacturability.” If a design feature is impossible to stitch or will make the bag too heavy, we will advise you immediately.
- Sourcing: We use your BOM to source the exact leather hide and hardware matches from the Guangzhou markets.
- Paper Patterning: We convert your measurements into a paper pattern to ensure the geometry works.
- Prototyping: We cut, skive, and stitch the first sample according to your specific edge finish and thread requests.
Conclusion
Building a Tech Pack takes time.
But it saves you months of sampling headaches and thousands of dollars in wasted materials.
Ready to start production?
2. Get a Quote: Already have your Tech Pack ready? Contact Milo Leather here to get a manufacturing quote for your project.
What part of the Tech Pack do you find the hardest to create? Let me know in the comments below.
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