Customization › Design & Structure

Custom Bag Design and Structure: Dimensions, Compartments, Straps

Every custom design bag starts as a dimensioned drawing: length, width and height in cm, capacity in litres, compartment count, pocket count, base construction and strap system. 10+ in-house designers turn a brief or a tech pack into a pattern, release 100+ new models a month, and sew a sample in 5–7 working days with one free revision. Bulk dimensions hold to ±1 cm; MOQ 300 pieces.
10+ in-house designers·100+ new models / month·Sample 5–7 days·Tolerance ±1 cm·MOQ from 300 pcs
Custom Design & Structure-venlinker

10+

In-house designers

100+

New models per month

5–7 days

Structure sample

By quote

Schedule confirmed for your order

300 pcs

MOQ per style

1

Free revision
Design elements

Custom Bag Design Elements: Dimensions, Compartments, Pockets, Base and Straps

Six structural decisions define a bag before fabric or logo is chosen. Each one is written on the tech pack in cm, litres or mm and checked against the golden sample in bulk.

Dimensions & Capacity

Specified as L × W × H in cm plus volume in litres. Gym duffels typically run 45–60 × 25–30 × 25–30 cm (30–55 L); yoga mat bags 65–72 cm long for a 61–66 cm mat; belt bags 1–3 L. Bulk tolerance is ±1 cm on any edge.
Tolerance ±1 cm · Volume measured in litres

Compartments

1–3 main compartments. Options include a TPU-lined wet/dry divider for wet-dry gym bags, a ventilated shoe compartment 32–36 cm long for EU 42, and a padded 13–16 in laptop sleeve in work-gym backpacks. Each divider adds 3–6 min of sewing time.
1–3 compartments · Shoe bay 32–36 cm

Pocket Count & Layout

Typical range is 3–8 pockets: internal zip pocket 15 × 12 cm, bottle pocket 8 cm diameter, key clip, phone sleeve 8 × 16 cm, front organiser. Each pocket adds 2–4 min of labour, so pocket count is the first lever on price for running waist packs and travel organizers.
3–8 pockets · +2–4 min each

Base Construction

Four options: flat sewn base, sewn base with a 2–3 mm PE board insert, moulded EVA base 4–6 mm, or a welded TPU tub for swim duffels. 4–6 metal feet 12–15 mm keep weekenders off the floor. The base decides whether the bag stands empty.
PE board 2–3 mm · EVA 4–6 mm

Strap Systems

Webbing 25–38 mm, adjustable 60–130 cm, 10 mm EVA shoulder pad, bar-tacked anchors rated for the loaded weight. Backpack conversion straps on convertible duffels, single 38–50 mm slings on mat sling bags, trolley sleeves 18–22 cm wide on travel duffels.
Webbing 25–38 mm · Adjust 60–130 cm

Closures & Openings

#5 or #8 coil zipper on a U-shape or straight top opening, 5 mm drawcord with barrel lock on drawstring bags, 3-roll roll-top on dry bags, 14–18 mm magnetic snap on totes. Opening width is set so a 30 cm shoe or a 66 cm rolled mat passes without force.
#5–#8 zip · 5 mm drawcord
Send a reference photo and five target dimensions; our designers return a dimensioned drawing and a quote within 24 hours.
Reference sizes

Custom Design Bags: Typical Dimensions, Capacity and Pocket Count by Bag Type

Industry-typical starting points our designers use when a brief has no numbers. All values are ranges; your tech pack sets the exact figure and bulk holds it to ±1 cm.
Bag type
Gym duffel
Typical size (cm)
45–60 × 25–30 × 25–30
Capacity
30–55 L
Compartments
1–2 + shoe bay
Pockets
4–6
Base
PE board 2–3 mm
Bag type
Gym backpack
Typical size (cm)
45–50 × 30–32 × 15–20
Capacity
20–30 L
Compartments
2 + laptop sleeve
Pockets
4–7
Base
Padded EVA 4 mm
Bag type
Yoga mat bag
Typical size (cm)
65–72 × 16–20 dia.
Capacity
Mat 61–66 cm
Compartments
1 + mat sleeve
Pockets
2–3
Base
Flat sewn
Bag type
Running waist pack
Typical size (cm)
20–30 × 10–14 × 4–8
Capacity
1–3 L
Compartments
1–2
Pockets
2–4
Base
None (soft)
Bag type
Weekender
Typical size (cm)
50–60 × 28–32 × 28–32
Capacity
35–50 L
Compartments
1–2 + shoe bay
Pockets
4–6
Base
PE board + 4–6 feet
Bag type
Wet/dry swim bag
Typical size (cm)
35–45 × 20–25 × 15–20
Capacity
10–25 L
Compartments
2 (TPU-lined wet)
Pockets
2–3
Base
Welded TPU tub
Bag type
Team sports duffel
Typical size (cm)
65–80 × 32–38 × 32–38
Capacity
60–90 L
Compartments
1–2 + end pockets
Pockets
3–5
Base
PE board + feet
Bag type
Work-gym tote
Typical size (cm)
40–48 × 30–36 × 14–18
Capacity
18–28 L
Compartments
1 + laptop sleeve
Pockets
4–6
Base
PE board 2 mm
Drawing
2D line drawing, cm
Capacity
Litres, measured
Tolerance
±1 cm
Sample
5–7 days
All eight categories in the product range use these reference sizes; each sub-type page lists its own spec table.
Process

Custom Bag Design Process: From Brief to Golden Sample in 10 Days

Six steps between a brief and a signed golden sample. Days are working days; a complete tech pack removes step 2 and saves 1–2 days.
Day 0

Brief or tech pack

Bag type, five target dimensions, capacity, pocket list, fabric preference and logo file. A photo of a competitor bag plus a tape measure is enough to start; see the RFQ checklist.
Day 1–2

Dimensioned drawing

A designer returns a 2D line drawing with every dimension in cm, a pocket map and a bill of materials. Two options are usual: one at your target price, one with the structure we recommend.
Day 2–4

Pattern and mock-up

Pattern pieces cut in the production fabric; a mock-up checks that a 30 cm shoe, a 66 cm mat or a 16 in laptop fits. Strap anchors are placed by loaded-weight test, not by eye.
Day 4–7

Sample sewn

Existing showroom samples are free, with courier paid by the buyer. Custom prototypes take 5–7 working days after the specification is confirmed. We quote the prototype fee, courier charge and any sample-fee credit before work starts.
Day 7–9

Review and revision

Existing showroom samples are free, with courier paid by the buyer. Custom prototypes take 5–7 working days after the specification is confirmed. We quote the prototype fee, courier charge and any sample-fee credit before work starts.
Day 9–10

Golden sample signed

The approved bag is sealed as the golden sample. Bulk is cut from its pattern and every line checks against it at inline inspection.
Drawing
1–2 days
Sample
5–7 days
Revision
1 free round
Bulk 300–1,000 pcs
Schedule confirmed in the quotation

Custom Bag Design Sample in 5–7 Days

Existing showroom samples are free, with courier paid by the buyer. Custom prototypes take 5–7 working days after the specification is confirmed. We quote the prototype fee, courier charge and any sample-fee credit before work starts.
Tech pack

Bag Design Manufacturer Tech Pack Requirements: What to Send

Four documents let us quote and sample without guessing. The bag tech pack guide has a template; if you have none, our designers draw it as part of the ODM route.

Dimensioned Drawing

Front, side and top views with L × W × H in cm, pocket positions measured from one reference edge, strap length range and opening width. PDF or AI; hand sketch with numbers is acceptable.
3 views · cm

Bill of Materials

Fabric per panel (e.g. 900D polyester body, 210D lining), zipper size and brand, webbing width, hardware finish and foam thickness. See the material guide for naming.
1 line per component

Construction Notes

Seam type, binding vs bagged-out lining, bar-tack positions, base insert and whether panels are padded. 5–10 lines is usually enough; the sample resolves the rest.
Seam + reinforcement notes

Logo & Placement

Vector file, Pantone codes and each logo position in cm from a fixed edge. Method is chosen on the logo page; placement holds to ±3 mm in bulk.
AI / PDF · ±3 mm
Common problems

Custom Bag Design Problems and How the Factory Prevents Them

Structural defects found most often at inspection on bags designed elsewhere, and the design control that removes each one.
Bulk bags measure 2–3 cm smaller than the sample
Cause: seam allowance not added to the pattern after revision. Control: pattern re-cut from the golden sample and 5 bags measured at first output; tolerance ±1 cm at inline inspection.
Mat does not fit the mat sleeve
Cause: sleeve sized to a 61 cm mat while the brand sells 66 cm × 6 mm mats. Control: mat length and rolled diameter (12–16 cm) written on the tech pack; tested with the real mat on the mat bag sample.
Strap tears out at the anchor
Cause: single stitch line on a 38 mm strap carrying 8–10 kg. Control: box-X bar-tack through a 2-layer reinforcement patch on every anchor of team duffels and travel duffels.
Bag collapses when empty on the retail shelf
Cause: no base insert or 1 mm board. Control: 2–3 mm PE board or 4–6 mm EVA specified on the drawing for any bag over 20 L; checked on the sample photo set.
Pocket count pushed price 15% over target
Cause: 8 pockets at 2–4 min labour each. Control: the day 1–2 drawing shows two versions, and the quote lists labour per pocket so pockets can be cut before sampling. See cost factors.
Shoe compartment too short for men’s or larger sizes
Cause: bay sized to the sample shoe. Control: shoe bay 32–36 cm long and 12–14 cm high as standard on shoe compartment bags, with a mesh vent panel of 40–60 cm².
Factory

Bag Design Manufacturer in Guangzhou: 10+ Designers on a 5,000 m² Floor

The design room, pattern table and sample line sit on the same floor as the 10+ production lines in Huadu District, so a drawing change reaches the sewing line the same day. 500+ staff, 50,000+ bags a month, factory tours Mon–Sat.

2010

Founded

5,000 m²

Factory floor

500+

Staff

10+

Production lines

50,000+

Bags per month

200+

Fabric suppliers

Get a Custom Bag Design Quote in 24 Hours

Send a photo or tech pack, five target dimensions and a quantity from 300 pcs. A dimensioned drawing, unit price range and lead time come back within one working day.
Related customization

More Custom Bag Options: Materials, Logo, Printing, Hardware, Packaging

Structure is the first of seven customization layers. Each layer below has its own page with specs, timing and cost effect.

Custom Materials & Colours

Polyester 600D–1680D, nylon 420D–840D, neoprene 2–4 mm, RPET, TPU/PVC, mesh, canvas 10–16 oz and PU from 200+ verified suppliers. Pantone lab dips in 5–7 days.
View details →
Compare costs in your quotation
Material guide · Material sourcing

Custom Logo & Branding

Our Guangzhou team coordinates design, cutting, sewing, printing and packing. Specialist logo or sealed-compartment requirements are reviewed during sampling, with the process and inspection criteria confirmed for your bag.
View details →
7 logo methods · Min logo 2 cm
Logo method guide · Inline inspection

Custom Graphics & Printing

Define the required test method, conditioning and pass criteria in the specification. Review the chosen material or logo method on the sample, and request an independent test where the programme requires one.
View details →
300 DPI artwork at actual size
Drawstring bags · Beach totes

Trims, Hardware & Accessories

Zippers #3 to #10 in YKK or SBS, buckles 20–50 mm, webbing 20–50 mm, sliders, feet and pullers. Custom-moulded hardware with your logo adds 10–15 days.
View details →
Stock hardware: 0 days added
Incoming inspection · Cost factors

Packaging & FBA Prep

Send the current requirements for your marketplace and destination, including barcodes, bagging, warnings, carton size and weight. We confirm the packing specification and its cost before production.
View details →
FBA-ready cartons · 100% packing check
Packing & export · Packing inspection

OEM / ODM Workflow

OEM builds from your tech pack; ODM starts from our 100+ monthly models and modifies fabric, colour, pockets and logo. Same 300 pcs MOQ, same 100% inspection, NDA on request.
View details →
sample in 5–7 working days after specification approval · ODM 5–7
OEM / ODM guide · Private label

All Customization Options

The hub page: 7 layers side by side, with a table of what each one does to price and lead time and an OEM vs ODM comparison. MOQ 300 pieces.
View details →
7 layers · 1 factory
Cost factors · MOQ guide

Custom Bag Sample in 5–7 Days

Existing showroom samples are free, with courier paid by the buyer. Custom prototypes take 5–7 working days after the specification is confirmed. We quote the prototype fee, courier charge and any sample-fee credit before work starts.
View details →
Credit terms agreed in your quote
Sample cost & lead time · Golden sample
Bag types

Custom Design Bags by Category: Gym, Yoga, Running, Travel, Swim

Every category below is drawn and sampled reviewed for your project. Category pages list 6–8 sub-types with the typical dimensions, capacity and pocket count for each.

Gym & Training Bags

Duffels 30–55 L with shoe bays; backpacks 20–30 L with laptop sleeves.
View details →
Gym duffels · Gym backpacks

Yoga & Studio Bags

Mat bags for 61–66 cm mats, sling bags and studio totes 18–25 L.
View details →
Mat bags · Pilates totes

Running & Outdoor Bags

Waist packs 1–3 L, running belts and hydration packs 5–12 L.
View details →
Running belts · Hydration packs

Outdoor & Travel Bags

Weekenders 35–50 L, daypacks 18–25 L, roll-top dry bags 10–30 L.
View details →
Weekenders · Dry bags

Swim & Wet Gear Bags

Wet/dry bags with welded TPU tubs, mesh swim bags and beach totes.
View details →
Mesh swim bags · Wet bags

Team & Equipment Bags

Team duffels 60–90 L, ball bags for 6–10 balls, racket bags.
View details →
Team duffels · Ball bags

Work-Gym Lifestyle Bags

Commuter backpacks 20–28 L with 13–16 in sleeves, totes and crossbodies.
View details →
Work-gym backpacks · Crossbody

Accessories & Sets

Pouches, shoe bags and organisers sized to match the main bag.
View details →
Gym bag sets · Dust bags
Buyer fit

Custom Bag Design for Startups, Activewear Brands, Creators and Private Label

Who asks for structural customization, and what the typical design brief looks like.

Startup & DTC Brands

One hero bag with 2–3 structural changes to an ODM base; 300–1,000 pcs; drawing to shipment in 40–50 days.
View details →

Activewear & Fitness Brands

Full tech packs for 3–8 SKUs per season; shared strap and pocket standards across duffel, backpack and tote.
View details →

Influencers & Creator Brands

Signature silhouette drawn from a sketch; 500–2,000 pcs per drop with a matching pouch set.
View details →

Private Label Programs

Range architecture of 5–15 styles sharing base construction and hardware, 2,000–20,000 pcs a year.
View details →
FAQ

Custom Bag Design: Frequently Asked Questions

Yes. Send a photo, five target dimensions (length, width, height, strap length, opening width) and the capacity you want. A designer returns a dimensioned drawing in 1–2 days and a sewn sample in 5–7 working days. The tech pack guide shows what a full pack adds.
±1 cm on any edge against the golden sample; strap length ±2 cm; logo position ±3 mm. Five bags are measured at first output and again at final inspection on every order.
No. MOQ stays at 300 pieces. Complexity changes the unit price through labour minutes (2–4 min per pocket, 3–6 min per divider), not the minimum. See the MOQ guide.
You do. Drawings, patterns and the golden sample are stored under your project code and are not offered to other buyers. An NDA is signed on request before sampling; details on the OEM/ODM workflow page.
Yes. A duffel drawn at 40 L can be graded to 30 L and 55 L from the same pattern in 1–2 days. Each size counts as a style for MOQ, so three sizes means 300 pcs each. Sets are common for private label gym bag sets.
For 30–55 L, a 2–3 mm PE board in a sewn base with 4–6 feet is the standard; it holds shape empty and adds little weight. A welded TPU tub is used when the base must be washable, as on swim duffels.
Existing showroom samples are free, with courier paid by the buyer. Custom prototypes take 5–7 working days after the specification is confirmed. We quote the prototype fee, courier charge and any sample-fee credit before work starts. sample development.
Start your design project

Get a Custom Bag Design Quote From the Factory

Send a photo or tech pack with your target dimensions and a quantity from 300 pcs. A dimensioned drawing, price range and lead time come back within 24 hours; a sewn sample follows in 5–7 working days.
Email
info@venlinker.com
Tel / WhatsApp
+86 133 6639 6425
MOQ
300 pieces
Sample
5–7 working days
Custom Design & Structure-venlinker

Have a Bag Project in Mind?
Share the bag type, quantity and target delivery date. We will review the details with you.