Custom bag manufacturing workshop banner
Technical Resources · Factory Reference

Technical Glossary

A practical procurement reference covering bag specifications, textile weights, industrial stitching, printing techniques, and international trade terminology.

01Engineering & Sourcing Reference

Mastering OEM Bag Specifications

Sourcing custom tote bags, backpacks, cosmetic pouches, and leather goods requires unambiguous technical dialogue between brand procurement teams and factory floor managers. When inquiries lack precise fabric weights, stitch tolerances, or closure requirements, development lead times increase and unit price accuracy degrades.

This technical glossary compiles essential terms verified through decades of direct factory production in Istanbul. Use this engineering guide to build complete Requests for Quotation (RFQs), define comprehensive Tech Packs, and ensure stringent quality compliance across international shipments.

Materials & Fabric Specifications Textiles & Substrates

GSM (Grams per Square Metre)

Technical Definition
The international standard unit measuring the areal density of woven, knitted, and non-woven textiles. Calculated as fabric mass in grams divided by surface area in square metres.
Manufacturing Impact
Directly dictates fabric drape, opacity, tensile burst strength, and cost. Promotional totes typically employ 140–180 GSM, retail bags utilize 220–280 GSM, whereas heavy-duty structured canvas requires 320–450+ GSM.
Factory Buyer Recommendation: Never quote fabric simply as "cotton" or "canvas". Specify explicit target GSM (or oz/yd²) with an acceptable mill tolerance of ±5% to secure accurate unit costs.

Cotton Canvas

Technical Definition
A heavy, plain-woven or duck-woven textile fabricated from multi-ply cotton yarns, characterized by tight weave structure and high dimensional stability.
Manufacturing Impact
Provides self-standing structural integrity suitable for high-volume beach totes, premium retail grocery bags, and structured utility packs without requiring internal laminates.
Factory Buyer Recommendation: For heavy beach totes carrying high loads, specify 300 to 350 GSM cotton canvas paired with reinforced cross-box handle stitching.

RPET (Recycled Polyethylene Terephthalate)

Technical Definition
Yarn spun from post-consumer recycled plastic bottles, converted into polyester pellets and woven or non-woven backings.
Manufacturing Impact
Delivers comparable tensile strength, abrasion resistance, and water repellence to virgin polyester while supporting certified ESG circular economy claims.
Factory Buyer Recommendation: Ensure your OEM supplier provides transaction-level GRS (Global Recycled Standard) certification to satisfy EU/US customs sustainability audit standards.

Non-Woven Polypropylene (NWPP)

Technical Definition
Thermoplastic polymer sheet material manufactured via spunbond extrusion, bonding extruded filaments with heated patterned rollers without weaving.
Manufacturing Impact
Offers an exceptionally economical unit cost, water resistance, and rapid ultrasonic seam sealing. Common in promotional tote runs from 70 to 120 GSM.
Factory Buyer Recommendation: Laminated NWPP allows full-bleed gravure printing with brilliant color depth, ideal for cost-efficient retail supermarket distribution programs.

Construction & Assembly Engineering Seams & Hardware

Bartack Reinforcement

Technical Definition
A specialized repeating zigzag stitch cluster applied horizontally and vertically across high-stress junctions using computer-controlled sewing machines.
Manufacturing Impact
Critical along handle-to-body connections, shoulder strap anchors, pocket top corners, and zipper terminations to prevent seam blowout under dynamic loading.
Factory Buyer Recommendation: Specify both a "Box-X" stitch and top perimeter bartacks on tote handle bases for bags intended to transport weight exceeding 10 kg.

Gusset (Bottom & Side Panels)

Technical Definition
An inserted triangular or rectangular textile panel engineered into the bottom or sides of a bag to expand three-dimensional internal capacity.
Manufacturing Impact
A flat tote requires 2 cut panels, whereas full-gusset construction requires 3 to 5 panels or specialized folding patterns, increasing fabric usage and assembly minutes.
Factory Buyer Recommendation: Clarify between a "T-bottom gusset" (folded and stitched corner) versus an "all-around continuous side/bottom gusset" when preparing cost estimation sheets.

Overlock & Bound Seams

Technical Definition
Edge finishes where multiple thread loops wrap raw cut textile edges (overlock) or where edge binding tape encases raw interior fabric margins.
Manufacturing Impact
Prevents unraveling of woven cotton and canvas interiors. Fully bound interior seams deliver an immaculate, high-end retail interior finish on unlined goods.
Factory Buyer Recommendation: For unlined commercial totes, specify self-fabric or polyester herringbone binding over internal overlock stitches for a pristine retail unboxing appearance.

Zipper Gauges & Sliders (#3, #5, #8)

Technical Definition
Numbered classifications indicating the horizontal tooth width in millimetres across closed interlocking teeth (e.g., #5 represents approximately 5mm tooth width).
Manufacturing Impact
#3 zippers suit lightweight cosmetic pouches and interior pockets; #5 is standard for tote bag main closures and backpacks; #8 to #10 are engineered for heavy luggage.
Factory Buyer Recommendation: Verify whether sliders require custom debossed brand pullers, zinc alloy galvanic plating (antique brass, matte black, shiny nickel), or water-resistant PU coatings.

Branding, Printing & Surface Finishing Industrial Decoration

Silkscreen Printing (Water-based & Plastisol)

Technical Definition
A stencil-based ink application where high-durability viscous inks are driven through woven mesh stencils directly onto cut fabric panels prior to sewing.
Manufacturing Impact
Most cost-effective for large production runs (500+ units) featuring 1 to 4 solid spot colors. Water-based inks offer a soft hand-feel on natural cottons; plastisol provides high opacity.
Factory Buyer Recommendation: Supply artwork mapped to Pantone Solid Coated (PMS) codes. Each discrete color requires a separate setup frame, which directly affects initial sampling cost.

All-Over Dye Sublimation

Technical Definition
Thermal gas infusion process where solid dye pigment transitions to gas under heat press pressure, bonding molecularly into polyester polymer fibers.
Manufacturing Impact
Enables true edge-to-edge, photorealistic, full-bleed artwork that will never crack, peel, or fade. Operates exclusively on 100% synthetic polymers or polyester coatings.
Factory Buyer Recommendation: Sublimation must be executed on flat cut-pattern panels prior to final sewing assembly to eliminate blank unprinted creases at seam margins.

Industrial Multi-Head Embroidery

Technical Definition
Automated computerized needle application stitching high-luster polyester or rayon embroidery threads into heavyweight textiles or canvas backings.
Manufacturing Impact
Produces a luxurious, raised textural aesthetic highly resistant to industrial laundering. Requires stable base substrates exceeding 240 GSM or tear-away backings.
Factory Buyer Recommendation: Embroidery pricing depends on total stitch count rather than color count. Convert fine typography (<5mm height) to screen print or woven labels for crisp clarity.

Blind Debossing & Foil Stamping

Technical Definition
Precision heat-and-pressure engraving utilizing precision-milled magnesium or brass dies to press recessed indentations into PU, leather, or synthetic patches.
Manufacturing Impact
Creates an understated, tactile luxury insignia without the chemical use of inks. Adding metallic foil introduces permanent reflective brand highlights.
Factory Buyer Recommendation: Specify die stroke depth and confirm material thickness on pre-production samples to avoid unwanted impression marks on reverse panels.

Sourcing, Sampling & Production Controls Procurement Workflows

Tech Pack (Technical Package)

Technical Definition
The authoritative blueprint document detailing complete orthographic product sketches, finished dimensions, seam construction tolerances, BOM (Bill of Materials), and vector artwork coordinates.
Manufacturing Impact
Eliminates development friction, accelerates sample lead times, and acts as the legally binding technical standard for quality control sign-offs.
Factory Buyer Recommendation: If you do not maintain an internal tech pack, send a physical benchmark sample or high-resolution multi-angle photos with explicit dimension annotations.

Pre-Production Sample (PPS)

Technical Definition
A finalized physical prototype fabricated on the exact factory production machinery using actual bulk fabric lots, custom-dyed trims, real zippers, and branded hardware.
Manufacturing Impact
Serves as the ultimate quality threshold. Once physically signed and counter-sealed by the buyer, all bulk cutting, sewing, and assembly strictly mirrors this physical golden unit.
Factory Buyer Recommendation: Always retain a duplicate counter-sample in your headquarters office to cross-reference against incoming master cartons upon final destination receipt.

MOQ (Minimum Order Quantity)

Technical Definition
The baseline volume threshold required by a production plant to justify dye-lot dyeing minimums, printing screen calibrations, and sewing line machine setups.
Manufacturing Impact
Standard cotton and canvas tote MOQs typically start at 500–1,000 units. Complex multi-compartment backpacks or custom PU hardware builds may require higher thresholds.
Factory Buyer Recommendation: Inquire about price tiered break points (e.g., 500, 1,000, 3,000, 5,000 units). Amortizing fixed setup and print screen fees sharply lowers unit costs at scale.

Production Lead Time

Technical Definition
The total working duration calculated from the precise date of written PPS sample sign-off and deposit receipt to final factory goods completion (Ex-Factory date).
Manufacturing Impact
Direct factory manufacturing in Istanbul averages 15 to 25 business days for typical textile tote programs, substantially faster than Far East shipping channels.
Factory Buyer Recommendation: Always calculate backwards from launch dates, budgeting 5–7 days for pre-production physical sample transit and review cycles.

Packaging, Export & Logistics International Trade

Incoterms (EXW, FOB, CIF, DDP)

Technical Definition
International Commercial Terms published by the ICC establishing the division of financial costs, customs risks, and shipping responsibilities between buyer and manufacturer.
Manufacturing Impact
EXW covers factory floor pickup; FOB covers Turkish port loading; CIF includes ocean freight and cargo insurance; DDP delivers directly to buyer warehouses duty-paid.
Factory Buyer Recommendation: For European enterprise buyers, road freight under DAP or DDP ensures 3–7 day overland truck transit directly from Istanbul across continental Europe.

CBM (Cubic Metres)

Technical Definition
The total volumetric space occupied by shipping cartons, calculated as (Length x Width x Height in metres) multiplied by the total number of master cartons.
Manufacturing Impact
Dictates container loading optimization (20ft vs. 40ft High Cube containers) and determines whether ocean freight charges are weight-based or volume-based.
Factory Buyer Recommendation: Heavy canvas totes compress effectively. Request flat bulk-packing optimization or multi-fold bundling to decrease CBM and minimize ocean freight overheads.

HS Code (Harmonized System Code)

Technical Definition
The standardized international customs classification code assigned to categorize commodities for tariff assessments, import duty rates, and customs clearances.
Manufacturing Impact
Cotton totes classify under HS 4202.92.98, synthetic backpacks under HS 4202.92.91, and genuine leather goods under HS 4202.31.00. Accurate coding prevents customs fines.
Factory Buyer Recommendation: VYGR Bags manages export declarations in-house. Confirm your national customs classification preference to guarantee seamless tariff alignment.

Master Carton Markings & Barcoding

Technical Definition
Standardized exterior carton labeling including PO numbers, SKU codes, carton sequences, net/gross weights, country of origin, and GS1-128 scannable barcodes.
Manufacturing Impact
Enables rapid automated scanning at 3PL fulfillment centers and distribution hubs, eliminating sorting errors upon destination warehouse intake.
Factory Buyer Recommendation: Provide carton layout marking templates with your initial PO to guarantee palletization matches your downstream retailer compliance manuals.

Quality Assurance & Regulatory Compliance Audits & Standards

AQL (Acceptable Quality Limit) ISO 2859-1

Technical Definition
A globally accepted mathematical sampling inspection standard that determines the maximum allowable number of defective units in a statistically selected random batch.
Manufacturing Impact
Industrial retail bag production typically adheres to General Inspection Level II, Standard AQL 2.5 for major functional defects and AQL 4.0 for minor cosmetic flaws.
Factory Buyer Recommendation: Establish objective defect classification definitions (e.g., loose thread >5mm vs. broken seam) prior to factory bulk release to ensure objective inspection metrics.

EU REACH & OEKO-TEX Standard 100

Technical Definition
Stringent regulatory safety frameworks testing chemical thresholds, azo dyes, heavy metals, formaldehyde, and phthalates in textiles and plastic accessories.
Manufacturing Impact
Non-negotiable requirement for consumer products distributed in the European Union and North American retail chains to protect human skin safety.
Factory Buyer Recommendation: Request verified raw material testing certificates during sampling to ensure full compliance before cutting bulk roll stocks.
Procurement Guidance

Frequently Asked Sourcing Questions

What critical information must be provided in an initial custom bag RFQ?

A comprehensive Request for Quotation (RFQ) should outline: bag silhouette type, target dimensions (Width x Height x Gusset depth in cm), preferred fabric composition and exact GSM weight, handle construction (webbing, self-fabric, rope) and drop length, branding technique with vector artwork, quantity tiers (e.g. 500, 1000, 2500 pcs), inner accessories (zipper, pockets, magnetic closures), target delivery date, and export delivery destination.

How do cotton and canvas totes differ in tactile behavior and pricing?

Both utilize cotton yarns; however, standard cotton bags utilize lightweight sheetings between 140 and 220 GSM that offer a soft, foldable drape best suited for promotional handouts and lightweight carrying. Canvas employs double-ply twisted yarns between 300 and 500 GSM, delivering a rigid, structured, self-standing hand-feel suited for premium paid retail products.

What is the standard sampling protocol before factory bulk production begins?

Following initial spec alignment, our pattern room builds a physical pre-production sample (PPS) incorporating confirmed fabrics, exact Pantone-matched screen printing, custom woven labels, and final stitching. Mass production begins only after receiving formal written buyer approval on the physical PPS.

Why source custom bag manufacturing in Istanbul, Türkiye rather than the Far East?

Manufacturing in Istanbul combines premium Turkish textile quality with geographic proximity: road transit reaches major European distribution hubs in 3 to 7 days, avoiding lengthy 30–45 day ocean freight windows. In addition, duty-free trade advantages under the EU-Turkey Customs Union reduce overall landed landed costs.

Ready to Launch Your Custom Bag Production?

Work directly with our factory engineering team in Istanbul. From pattern sampling and fabric sourcing to in-house printing and EU/US export documentation, we bring precision and reliability to every bag run.

Get Catalog Direct Factory Quotes · 24h Response