Start with how the bag will be used
A cooler bag program is easier to quote when the use is clear. Daily lunch, picnic and retail, outdoor carry, and food delivery place different demands on capacity, opening, lining, structure and carry. State who uses the bag, what it must hold, and which failures would make it unsuitable — a lining that is hard to wipe, an opening that is too narrow, or a strap that cannot take the loaded weight.
Yishu Bag is a Dongguan OEM and ODM manufacturer. You can start from a published reference model, a physical sample, or a brief. Materials, dimensions, compartments, color, branding and packing are then reviewed against that brief. The approved sample and written specification become the reference for production.
If you already have a model in mind, link it from the product range and list the changes. A marked-up photo often communicates openings and pockets more clearly than a long paragraph.
Reference models already on this site
These models are starting points, not fixed catalog items. Construction can be adapted after the use case is clear.
Cylindrical coolers. A compact, upright cooler with an insulated lining, a wide dual-zipper opening, top handles and an adjustable shoulder strap. See the TrailFold Insulated Cooler Bag (model YS-2409): polyester shell, aluminum-foil insulated lining, wipe-clean interior, and a 20 L reference capacity (26 cm high × 23 cm diameter).
Insulated lunch bags. A smaller food-carry shape for work, school or retail programs. See the Tropical Pineapple Insulated Lunch Bag (model YS-2413): aluminum-foil PEVA lining, flap closure with velcro, top handle and an adjustable shoulder strap. A matching lunch bag also appears in the Strawberry Kids Backpack & Lunch Bag Set. Everyday lunch carry is covered in more detail on our insulated lunch bag manufacturer page.
Picnic coolers. A wider, zip-top cooler intended for shared food and drinks, with integrated hand grips and an insulated lining. See the Daisy Picnic Cooler Bag.
Insulated delivery backpacks. A structured carry system with access from more than one side and a supported, divided interior. See the Insulated Food Delivery Backpack with Dual Opening and Support Boards: foil-lined three-room interior, removable dividers and two support boards.
If you need a different silhouette — a cooler tote, a bottle carrier, or a size not shown — send a reference and the intended use. We will map a practical construction before sampling.
Construction details to lock before sampling
The way an insulated bag performs depends on the shell, the lining, the closure, and how the panels are assembled. A product photograph is not a performance guarantee. Thermal results vary with lining, load, ambient conditions and how the bag is closed. If you have a test method or a market requirement, write it into the brief and the sample plan.
- Use and capacity: Lunch, picnic, outdoor or delivery; approximate volume or the items the bag must hold.
- Shell material: Polyester and other coated or woven shells can be reviewed against wear, print method and hand feel. Final color is confirmed from physical swatches.
- Insulation and lining: Current references use aluminum-foil insulated linings, including foil PEVA on the lunch bag. Lining choice should match cleaning, food-contact expectations and the destination market — these are confirmed per project.
- Structure: Cylindrical or rectangular form, base reinforcement, dividers, support boards, and whether the bag must stand open or sit upright when loaded.
- Closure and carry: Dual zippers, flap and velcro, or a zip top; handles, shoulder straps and chest straps where needed.
- Branding and packing: Logo method, labels, zipper pulls, and export or retail packing.
Branding, production and packing
Identity can be built into the shell, the trim or the labels. Routes shown on our capabilities page include screen printing, embroidery, heat transfer, woven labels, rubber and leather patches, embossing, metal branding and custom construction. The suitable method depends on the fabric, the graphic, and how the bag will be cleaned and handled. We confirm the decoration route on the sample, together with color matching for shell, lining, webbing and zipper tape.
Development, sampling, production and packing stay in one working system at our Dongguan factory. Each program is planned to move through the six checkpoints on our quality page: requirement review, material check, pre-production sample, in-line inspection, final inspection, and packing release. Bulk timing is agreed per order after sample approval, material review and order confirmation.
If material evidence is part of the brief, how to read bag material reports explains how to match a report to a specific component. A report on one submitted sample does not automatically apply to a new material or a new order.
What to send with the first inquiry
The custom bag RFQ checklist lists the details that make a quote and a sample more useful. For an insulated bag, please include as much of the following as you have:
- Intended use (lunch, picnic, outdoor, delivery or other)
- Target quantity and destination market
- Size, capacity, or a list of items the bag must hold
- Preferred shell, lining and insulation, if known
- Logo artwork and preferred decoration method
- Packing needs and target date
- Any test method the market requires
- Reference photos, a tech pack, or a physical sample
Files can be attached on the inquiry form (JPG, PNG, WebP or PDF). On the form, choose Insulated bag as the product type.
Questions buyers usually ask
Can you customize the size, lining and logo? Yes. Published models are ODM starting points. Materials, color, dimensions, interior layout, hardware, lining and branding are reviewed before sampling. Production follows the approved sample and specification.
Do you make lunch bags as well as larger coolers? Yes. Current references include a cylindrical cooler, an insulated lunch bag, a picnic cooler and an insulated delivery backpack. A lunch bag can also be developed as part of a matching set. See the lunch bag manufacturer page for the smaller everyday formats.
Can I request a sample before bulk production? Yes. Sample cost and timing depend on the level of customization and material availability, and are confirmed before development begins.
How is quality controlled? Critical functions — opening, lining finish, stitching and strap attachment — should be agreed in the specification and checked along the six production checkpoints.
Share the use case, a reference, target quantity and destination market through the inquiry form. Our team will help define the next practical step, usually a clarified specification and a sample route. You can also write to sales@yishubags.com.