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カスタム包装測定ガイド

正確な箱の測定は、パッケージのカスタマイズに成功した基礎です。剛性ギフトボックス、輸送用ダンボール、香水ボックス、チョコレートボックス、豪華紙パッケージの開発にかかわらず、正確なサイズは製品の保護、コストの制御、生産ミスの防止に役立ちます。

2025年9月17日件名：箱の寸法測定長さ×幅×高さ・内部寸法・外寸法・カスタムパッケージ

包装測定サポートのリクエスト開発サンプルの表示

迅速な回答

箱のサイズは長さ×幅×高さで表示しなければならない。

製品の嵌合とインサートには、内部寸法を使用します。運賃、ダンボール積載、宅配価格の場合は、外寸法を使用します。

Box dimension measurement diagram showing length width and height

はじめに

なぜ正確な箱の測定がカスタムパッケージで重要なのか

数ミリでカスタムパッケージプロジェクトの結果を変更できます。箱が小さすぎると、製品が合わないかもしれません。箱が大きすぎると、製品が輸送中に移動する可能性があり、挿入物が緩んで見える可能性があり、ブランド展示はそれほど高級ではないと感じる可能性があります。

カスタム包装の場合、正確な測定は工場が正確な金型ラインを作成し、適切な板材の厚さを選択し、インサートを設計し、材料コストを推定し、サンプルの変更を繰り返さないようにするのに役立ちます。

01・標準測定

常に「長さ×幅×高さ」の順にボックスを測定する

同じ測定順序を使用すると、設計チーム、購買チーム、包装工場間のコミュニケーションエラーを防ぐことができます。

長さ

長さは通常、箱の開口部の最長辺です。長方形ボックスの場合、これが最初に指定すべき数値です。

幅

幅は通常、箱の開口部の短い辺です。製品と内部トレイの足跡を工場で理解するのに役立ちます。

高さ

高さとは、開口部からベースまでの垂直距離のことです。蓋と台座箱、磁性箱、剛性箱の場合、高さは製品の隙間と挿入深さに影響します。

推奨フォーマット

Write dimensions like this: 180 × 120 × 60 mm. Always add the unit, such as mm, cm or inches.

02 · Internal vs External

Internal dimensions and external dimensions serve different purposes

One of the most common mistakes is sending external box dimensions when the supplier needs internal product-fit dimensions, or sending internal dimensions when the logistics team needs shipping size.

Internal dimensions

Internal dimensions refer to the usable space inside the box.

最適な用途: product fit, inserts, trays, bottle cavities, gift sets, cosmetic boxes, perfume boxes, chocolate boxes and jewelry boxes.

External dimensions

External dimensions refer to the full outer size of the box after production.

最適な用途: shipping cartons, courier pricing, warehouse storage, pallet loading, export packing and dimensional weight calculation.

Buyer tip

When requesting a quote, send both product dimensions and target box dimensions if possible. This allows the factory to recommend the correct inner space, board thickness and insert design.

Measuring a luxury rigid box with a ruler on a worktable

03 · Step-by-Step Guide

How to measure a custom packaging box correctly

Step 1: Prepare a rigid ruler or measuring tape Use a tool that stays straight. For small luxury boxes, a rigid ruler is usually more accurate than a soft measuring tape.

Step 2: Identify the opening direction Measure from the actual product opening, not from a random side. The opening direction affects length, width and height communication.

Step 3: Measure the length Measure the longest side across the opening. Keep the ruler straight and read the measurement at the inner edge or outer edge depending on your purpose.

Step 4: Measure the width Measure the shorter side across the opening. For tight product fit, record the exact internal width and leave suitable tolerance.

Step 5: Measure the height Measure from the top opening to the bottom. For lid-and-base boxes, also consider lid height and base height separately if needed.

Step 6: Confirm tolerance with the factory Packaging is made from physical materials, so production tolerance is normal. For rigid boxes and inserts, tolerance should be discussed before sampling.

04 · Box Type Differences

Different packaging structures require different measurement attention

Do not measure every box the same way without considering structure. A drawer box, magnetic box, tube box and folding carton may all need different measurement notes.

Rigid lid-and-base boxes

Measure the base internal size for product fit. If the lid covers the base deeply, also confirm lid height and overall closed box height.

引き出しボックス

Measure the inner tray size, outer sleeve size and pull-out clearance. A drawer that is too tight can affect user experience.

Magnetic closure boxes

Measure the usable inner space, flap thickness, magnetic closure position and product clearance after the lid is closed.

チューブボックス

Measure diameter and height instead of length and width. For paper tubes, confirm inner diameter, outer diameter and cap height.

折り畳みトレイ

Measure the assembled inner size and confirm tuck flap direction, glue flap position and board thickness before creating the dieline.

Custom skincare rigid box with inner tray and product cavities

05 · Insert & Product Fit

Product dimensions are just as important as box dimensions

For premium packaging, the insert is often the part that decides whether the product feels secure, organized and luxurious. To design a correct insert, the factory needs accurate product measurements.

Measure the product body Record the product length, width, height, diameter, thickness and special shape details.

Measure fragile or raised parts For bottles, measure the cap, shoulder, pump, spray head and base diameter. For jars, measure lid and body separately.

Confirm product weight Heavier products may require thicker board, stronger insert material or additional support areas inside the box.

Leave suitable tolerance A cavity that is too tight may scratch the product. A cavity that is too loose may allow movement during shipping.

Best practice Send physical product samples to the factory when possible. This allows the packaging team to test fit, insert depth, removal experience and shipping protection more accurately.

06 · Cost Impact

Correct measurement can reduce material waste and shipping cost

Oversized packaging may look harmless at the sample stage, but it can increase board usage, insert cost, carton volume, dimensional weight and warehouse space.

Material cost

A larger box uses more greyboard, wrapping paper, glue, insert material and carton space. Right-sizing helps control unit cost.

Shipping cost

Couriers and freight carriers often consider external size and dimensional weight. A box that is too large may increase shipping charges even if the actual product is light.

Storage efficiency

Well-measured packaging helps brands improve carton loading, pallet layout, warehouse storage and retail backroom handling.

Sustainability value

Smaller and more accurate boxes can reduce paper waste, insert waste, transport space and unnecessary packaging materials.

07 · Common Mistakes

Avoid these box measurement mistakes before requesting a quote

Many packaging delays happen because the first size information was incomplete, unclear or measured from the wrong reference point.

Sending product size as box size

The product size is not the same as the final box size. The box must include clearance, insert space, board thickness and opening structure.

Confusing internal and external dimensions

Always label whether your measurement is internal size or external size. This is especially important for rigid boxes and shipping cartons.

Forgetting the insert thickness

EVA, foam, paperboard, molded pulp and blister trays all take up space. The product cavity must be designed together with the box size.

Ignoring board thickness

Rigid boxes use thick greyboard, so the difference between inner and outer size can be significant. This must be calculated before production.

Using unclear units

Never send only numbers. Always include units such as mm, cm or inches, and keep the same unit throughout the project.

08 · GPLPAK Support

How GPLPAK helps brands measure and develop custom packaging

GPLPAK supports custom paper packaging projects from product measurement and structure planning to sampling, insert testing, production and export packing.

Packaging consultation Review product dimensions, product weight, packaging goal, target market, sales channel and budget direction.

Structure recommendation Recommend suitable rigid boxes, drawer boxes, magnetic boxes, lid-and-base boxes, folding boxes, tube boxes or custom shaped boxes.

Insert and cavity design Develop EVA, foam, paperboard, molded pulp, blister tray or custom cavities according to product dimensions and protection needs.

Sampling validation Provide white samples, printed samples, fit testing, opening experience review and pre-production confirmation before bulk orders.

Export-ready packing Support carton packing, shipping size calculation, moisture protection, quality inspection and international delivery coordination.

Project Checklist

Checklist before sending box dimensions to a supplier

Confirm whether the measurement is internal size or external size.

Use the standard order: Length × Width × Height.

Add units clearly, such as mm, cm or inches.

Measure the actual product, including cap, lid, pump, shoulder, base and fragile parts.

Confirm product weight and whether the box needs extra reinforcement.

Tell the supplier whether you need an insert, tray, divider, sleeve or inner support.

Confirm sales channel: retail, e-commerce, gifting, PR kit, wholesale or export shipping.

Approve a sample before mass production, especially for rigid boxes and inserts.

09 · FAQ

FAQs about measuring box dimensions

What is the correct order for box dimensions?

The correct order is Length × Width × Height. This order should be used consistently when communicating with a packaging supplier.

Should I provide internal or external dimensions?

Provide internal dimensions for product fit and insert design. Provide external dimensions for shipping, carton loading and logistics cost estimation.

How much clearance should I leave around the product?

The clearance depends on product material, insert type, box structure and shipping risk. Fragile glass bottles usually need more secure insert support than flat paper products.

Why does board thickness matter?

Rigid paper boxes use thick greyboard, so the outer size will be larger than the inner usable space. Board thickness affects structure, product fit and shipping size.

Do I need a sample after confirming dimensions?

Yes. A white sample or printed sample helps confirm size, product fit, insert accuracy, opening experience, surface finish and carton packing before mass production.

Get your custom packaging dimensions right from the start

If you are developing custom packaging for perfume, cosmetics, wine, chocolate, jewelry, candles, watches or premium gifts, GPLPAK can help you measure products, design the right box structure, create inserts and validate samples before production.

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