Not every bottle a brand can imagine is a bottle a factory can make. Capacity, wall geometry, neck finish and closure assembly each have a hard limit, and hitting one of them can end a project before it starts. Below: the limits we actually work within, the requests we have to decline or redirect, and how to test a design in one email instead of five rounds.
Quick answer
- Very small and very large capacities exist but narrow the material and process options. Ask the minimum viable capacity for your material before designing.
- Dual-chamber, dual-outlet and some geometries are case-by-case, not catalogue items. A feasibility check costs nothing and saves a tool.
- MOQ is 5,000 pieces per model and per colour. A design that needs a new tool usually needs that quantity on the first run.
What are the real capacity limits, and why do they move with the material?
There is no single minimum bottle size. The limit is set by the material, the neck finish and the process, and those three move together.
| Capacity band | What constrains it | What to ask | Our position |
|---|---|---|---|
| Under about 5 ml | Neck finish becomes disproportionately large relative to the body; metering and filling get difficult | Is there an existing stock model, or does this need a new tool? | Rarely practical in plastic; usually a component or an applicator instead |
| 5–30 ml | Neck finish and wall thickness compete for the same space | Minimum capacity for the material, plus MOQ and tool cost | Doable, but MOQ and tooling dominate the economics |
| 30–100 ml | Standard territory for stock moulds | Closest stock model, weight, neck finish | Broadest choice; many stock moulds available |
| 100–500 ml | Wall thickness and drop performance | Empty weight, material, closure compatibility | Broadest choice; the core of our catalogue |
| 500 ml – 2 L | Blow-mould tooling and handling; heavier products move to jerrycan forms | Handle, closure, dosing, pallet and carton data | Available, with a narrower shape range |
| Above 2 L | Machine and handling limits; wall deflection under a heavy fill | Ask for a feasibility opinion on the geometry | We will say plainly where our ceiling is |
The practical point: a request for the smallest possible bottle is really a request about economics. Below a certain capacity the neck finish and the wall cost more than the body, which is why a 5 ml requirement often has a better answer in a different component than in a plastic bottle.
Which shapes are catalogue items, and which are case-by-case?
Most of what we sell is a variation on a proven geometry. A few constructions are genuinely engineered per project, and they need a feasibility conversation rather than a quotation.
| Construction | Status | What makes it feasible or not | How we handle the request |
|---|---|---|---|
| Round, oval, rectangular, flat panel | Catalogue | Established geometries across all capacities | Quote from stock moulds where a match exists |
| Squat wide jar, low profile | Catalogue | Height-to-diameter ratio within tooling norms | Quote; check double-wall feasibility separately |
| Dual-chamber, one closure each end | Case by case | Two formulations must stay separate; internal separation geometry | Feasibility check first, then tooling estimate |
| Trigger spray, pump, dispenser assembly | Catalogue closure | Neck finish must match a standard sprayer | Quote bottle and closure separately, as standard |
| Faceted or geometric surface | Case by case | Deep facets complicate wall control and release from the tool | Feasibility check; often adapted from an existing model |
| Handle or grip, integrated | Case by case | Handle geometry changes wall distribution; usually 500 ml and up | Feasibility check; often a jerrycan family |
| Thick-walled, double-wall | Case by case | Wide low cylindrical forms suit it; tapers and waists do not | Feasibility check against the drawing |
| In-mould labelling | Process condition | Fixed versions only, no rework, label stock supplied to spec | Confirm label supply and version count before quoting |
Our practice is to say yes where we can and to say no where we cannot, in the same reply. A supplier who confirms every idea sounds enthusiastic; a supplier who tells you which three of your ten requests need engineering is giving you information you can plan around.
How do you test a design for feasibility in one email?
Most feasibility loops happen because the first email described a feeling rather than a specification. This is the format that resolves in a single exchange.
| Send this | Why it answers the hard questions |
|---|---|
| Target nominal capacity, and the fill volume you actually need | Separates a workable size from an over- or undersized bottle |
| Overall dimensions, or a drawing with one reference dimension | Wall thickness and neck position cannot be judged without scale |
| Material preference, and what the formula contains | Decides PET versus HDPE, and whether a barrier option is needed |
| Neck finish, if you already have a closure or a filling line | The single most common reason a promising design cannot proceed |
| How the pack dispenses: pump, spray, cap, dosing, flip-top | Closure availability is often the real constraint, not the bottle |
| Decoration: print, label, in-mould, hot stamping | Some decorations constrain geometry and version count |
| Order quantity, and whether this is a first order or a repeat | Determines stock mould versus new tooling |
| Destination market | Decides the documentation set attached to the quotation |
Eight lines. A factory that replies with a feasibility opinion, a stock-model suggestion where one exists, and a clear list of what needs tooling has given you a real answer — and if a stock model is close, the stock versus private mould question usually decides whether you need a tool at all.
What did buyers actually ask us?
Real questions from inquiries we handled. Company names, countries and order quantities are removed — those are our customers’ business, not ours to publish.
“We would like to make a bottle that appears as one continuous package from the outside, while two formulations remain completely separate inside, with a separate closure at each end. Is this technically feasible with your manufacturing capabilities, and can you develop a custom mould from our CAD?” — personal care brand
“Could you let us know what your minimum capacity requirement is, and the corresponding MOQ, pricing and mould costs? We are open to exploring a larger capacity that works with your equipment.” — colour cosmetics brand, North America
“We would prefer to delay the investment in tooling. Do you have bottles of a similar size to the design attached, or could you estimate the price for that design for our consideration?” — car care brand, South Asia
“We want a thick-walled bottle in our own shape with a 28/410 neck thread, and we would need matching pumps where the neck has to fit both your pump and ours.” — accessories brand, North America
Two of these four were solvable from stock. They were only solvable because the buyer let us look at the requirement instead of demanding a number immediately.
What are the three mistakes we see most often?
1. Designing the closure last. The neck finish decides whether a standard pump, cap or sprayer fits. If the exterior is designed and then the closure is chosen, a promising shape can become unmanufacturable for a standard part. Confirm the closure first — our neck finish reference lists the standard sizes.
2. Asking for a capacity that is technically possible but commercially absurd. It can be moulded. It can also be priced in a way that ends the project, because the tooling, not the material, dominates below a certain size. Ask for the minimum viable capacity for your material and then choose.
3. Requesting a bespoke geometry without a feasibility step. Dual chambers, integrated handles, deep facets and double walls are all real, and all need a check against the drawing. A feasibility opinion before tooling costs a drawing; after tooling it costs the tool.
What to send before you brief any factory
Send this list and compare the replies side by side. The quality of the answer tells you more than the price in the first reply.
- Nominal capacity and actual fill volume, stated separately
- Material, chosen with the formula in mind rather than with the shelf in mind
- Neck finish, or the closure you intend to use
- Outer dimensions, or a drawing with one reference dimension so it can be scaled
- Empty bottle weight in grams, or a range you would accept
- Decoration method and the number of versions
- Order quantity for the first run, and how it grows afterwards
- Destination market, so documentation is quoted with the price
- Whether you need a new tool, and whether a stock model would be acceptable
- A deadline, stated as a date rather than “as soon as possible”
A supplier who answers all ten has sized your project. A supplier who answers three and asks for a drawing has also told you something useful. What you want to avoid is a quotation with no feasibility comment at all. If the answer is that you need a tool, what mould cost and sampling time actually involve is worth reading before you commit.
Frequently asked questions
What is the smallest bottle you can make?
It depends on material and neck finish rather than on a fixed number, and very small volumes are usually uneconomic in plastic. Send us your required fill volume and we will confirm the smallest practical capacity and what it costs at MOQ.
Can you make a dual-chamber bottle with a closure at each end?
It is feasible case by case, because internal separation geometry and filling order both have to work. We run a feasibility check against your CAD before quoting tooling.
How large can bottles get before this stops being practical?
We work up to about 2 L. Beyond that, machine size, wall deflection under a heavy fill and handling all become constraints. Send dimensions and fill weight and we will say where our ceiling is.
Do I need a new mould, or can you modify an existing one?
Often a stock model is close enough, and we hold more than 2,000 existing moulds. Send your dimensions and we will show you the closest matches before quoting a tool.
How long does new tooling take?
About 30 working days for new tooling at our factory, before production begins. Stock moulds are faster, and sampling an existing tool is typically a few days.
What is the minimum order for a custom design?
MOQ is 5,000 pieces per bottle model and per colour. A new-tool project normally runs at that quantity on the first order.
About Shijin Packaging
Shijin Packaging Products Co., Ltd. has been manufacturing plastic packaging in Shenzhen, Huizhou and Guangzhou since 2003. We hold more than 2,000 existing moulds, run ISO 9001, GRS and SGS-audited production, and ship roughly 500,000 bottles a day for cosmetic, personal care, household, car care and food-grade customers. When a design sits outside our limits, we say so in the first reply, because a feasibility answer costs nothing and a cut tool costs everything.
Send us your capacity, dimensions, neck finish and closure — four lines is enough — and we will tell you whether a stock model fits, what needs tooling, and what the MOQ would be.