Can a custom plastic box manufacturer take fewer than 1,000 units?

Answer: Yes, at 1.35 times with single colour print; under 100 units, use a stock box.

Is a 1.2 mm wall enough?

Answer: Under 500 g it holds; above 1 kg start at 1.8 mm. Thin boxes fail at the base corners.

Is an in-mould label worth it on a small box?

Answer: At 3,000 units with a full colour face, yes: 0.65 CNY replaces a labelling step; at 1,000, screen print is cheaper.

Who draws the insert?

Answer: The buyer supplies the part outline, the plant the insert drawing, both sign; a photo alone leaves errors near 0.8 mm.

How is late delivery handled?

Answer: Fix three milestones, 12 days tooling, 3 trials, 10 production, and charge 0.3 percent a day.

Custom Plastic Box Manufacturer Checklist: Six Sourcing Points

Quick answer: Brief a custom plastic box manufacturer with six written items: box type and size band, cavity count and unit cost, print method and colour count, insert material, the 1,000 unit step, and packing with shipping marks. With all six on paper, price gaps point at process rather than guesswork.

Six Items on the Checklist
Box Type and Size Bands
Cavity Count and Unit Cost
Printing, Colour Count and Inserts
1,000 Unit Minimum, Packing and Shipping Marks
FAQ

1. Six Items on the Checklist

Small boxes are the easiest thing to brief badly. Ask for a five litre box and ten suppliers return ten prices, because wall, cavities, print and insert were never fixed. A custom plastic box manufacturer needs six lines, each with a range:

Box type: flat lid, hinged, lid and base, or drawer, in bands from 0.5 to 20 litres.
Cavities: 1x4 cuts unit cost 28 percent against 1x2, so cavities follow volume.
Print: screen, pad, in-mould label or hot stamp, screens billed apart above three colours.
Insert: EVA, vacuum PET, pulp or flocked sheet, density and thickness in numbers.
Volume: 1,000 units to start, 3,000 and 10,000 quoted apart, tooling stated.
Packing: bag, divider, carton, marks set by port and carton sequence.

The fourth item is the one buyers skip. An insert sets cavity depth and assembly time, so fix it before the box.

2. Box Type and Size Bands

An outside dimension alone tells a supplier nothing. A custom plastic box manufacturer needs internal size, wall and draft together: 260 by 180 by 110 mm at a 1.8 mm wall lets the plant compute weight and cycle, while an outside size invites prices that drift 20 percent.

Custom plastic box manufacturer: a beige box open on a long bench, grey foam in the lid, divided insert holding wrenches, warehouse racking behind

Band	Internal size	Wall	Cavities	Unit price
0.5 litre	150x100x45 mm	1.2 to 1.5 mm	1x8	0.85 to 1.10 CNY
2 litre	220x150x80 mm	1.5 to 1.8 mm	1x4	1.60 to 2.05 CNY
5 litre	260x180x110 mm	1.8 to 2.0 mm	1x4	2.35 to 2.90 CNY
12 litre	350x250x150 mm	2.0 to 2.3 mm	1x2	4.80 to 5.60 CNY
20 litre	420x300x180 mm	2.3 to 2.5 mm	1x1	8.20 to 9.40 CNY

Price climbs faster than volume past 12 litres: the wall goes from 2.0 to 2.3 mm, the cycle from 28 to 40 seconds, the press above 500 tonnes.

3. Cavity Count and Unit Cost

A 1x4 tool runs about 38,000 CNY against 22,000 CNY for 1x2. The 1x4 route saves 28 percent per unit at 2.35 CNY, so the 16,000 CNY gap closes after roughly 2,400 pieces.

Cavities are bounded by press and cycle. A 1x4 five litre box on a 280 tonne press runs 28 seconds, about 12,000 pieces a day; 1x2 runs 22 seconds for 6,500. Capacity is cavities times cycle times usable hours.

Tooling ownership needs its own sentence. Plants offer the mould free and plant-owned; change it to buyer ownership, the number on the frame, and a right to collect within a year.

Three trial shots are standard, covering gates, ejectors and shrink; the fourth onward bills at 1,500 CNY.

4. Printing, Colour Count and Inserts

Print decides looks and minimum order at any custom plastic box manufacturer. Screen printing needs one screen per colour at 300 CNY, pad printing suits curved areas at 180 CNY per plate, in-mould labels need a 6,000 CNY tool, and hot stamp runs 0.35 CNY a spot.

Custom plastic box manufacturer: a grey box open on a wooden table, foam insert holding a tape measure, scissors and thread spools, cartons beside

Method	Where it works	One-off	Per unit	Minimum
Screen	Flat lid face	300 CNY per colour	0.12 CNY a colour	1,000
Pad	Curved, small area	180 CNY per plate	0.08 CNY a colour	1,000
In-mould label	Full colour face	6,000 CNY tool	0.65 CNY	3,000
Hot stamp	Local logo	800 CNY die	0.35 CNY a spot	1,000

A custom plastic box manufacturer should price the insert by protection level, not habit. EVA at 30 density and 20 mm costs 3.8 CNY a set, 0.6 mm vacuum PET 1.2 CNY, pulp 0.9 CNY but only to plus or minus 1 mm. Leave 0.5 mm clearance per side.

5. 1,000 Unit Minimum, Packing and Shipping Marks

Minimum: 1,000 units; below that the price runs 1.35 times, or the job moves to a stock box with labels.
Steps: 3,000 units cut 6 percent, 10,000 cut 12 percent, tooling absorbed at 10,000.
Lead time: 12 days tooling, 3 trials, 10 production, 25 in total from sample sign-back.
Packing: PE bag each, dividers of ten, 50 per carton, five layer board, six high.
Marks: product and quantity on the face, carton number and weight on the side.
Inspection: AQL 2.5, register drift under 0.3 mm, latches surviving 500 cycles.

Terms from a custom plastic box manufacturer run 30 percent deposit, 70 percent against the bill of lading copy. Freight reaches 8 percent of landed cost, so carton efficiency moves the total more than price.

Conclusion

Small box sourcing is a writing exercise, not a price fight: size band, cavities and unit cost, print and colour count, insert material, the 1,000 unit step, packing and marks. Once the numbers exist, quotations lose their fog. Pick a custom plastic box manufacturer that splits insert and print apart.

This article discusses only the container (case body) side of specifications and design intent, and does not cover any handling, loading or use of the contents.