Packing Boxes for Shipping: A Step-by-Step Guide to Size, Strength and Cost

Here is a number that surprises most new sellers: the courier often charges you for the size of your box, not the weight of your product.

That is why choosing packing boxes is not just about protection. The right box keeps the product safe, keeps courier bills down and makes the parcel look like it came from a real brand. The wrong one does the opposite on all three counts. InkPrint's printed shipping boxes cover the most common sizes, but the steps below will help you pick well from any range.

Step 1: Measure the product, not the old box

Measure the product itself, in centimetres, as length x width x height, with any inner packaging it will travel in. Then add a small allowance for cushioning: about 1-2 cm on each side for most items, a little more for glass or electronics.

Write down the packed weight too. You will need both numbers in the next steps.

Step 2: Choose the box style

Different box styles suit different products and different budgets:

Box style	What it is	Good for
Regular slotted carton	The classic brown shipping box with four top and four bottom flaps	General shipping, bulk orders, warehouse storage
Mailer box	A die-cut box with a tuck-in lid, no tape needed on top	D2C and subscription orders, gifting
Die-cut box with inserts	A custom-shaped box with slots that hold the product	Fragile items, multi-product kits

If your customers will open the parcel on camera, or you sell gifts, a printed mailer box makes a far better first impression than a taped carton.

Step 3: Match the strength to the journey

Strength comes mainly from the number of layers (the ply). As a rough rule:

• 3 ply for light, non-fragile items travelling short or medium distances.
• 5 ply for heavier, fragile or high-value items, or long routes across India.

Think about the whole journey, not just the product. A parcel from Delhi to a small town in Kerala may change hands five or six times and sit under heavier boxes in a truck. If you see crushed corners in your returns, the box is too weak.

Step 4: Check the volumetric weight before you order

Most couriers in India charge for whichever is higher: the actual weight or the volumetric weight. Volumetric weight is usually worked out as length x width x height in centimetres, divided by 5,000 (some couriers use 4,000).

A quick example. A 600 g bottle of hair oil packed in a 30 x 25 x 20 cm box has a volumetric weight of 30 x 25 x 20 / 5,000 = 3 kg. You would be billed for 3 kg, five times the real weight. Pack the same bottle in a 20 x 12 x 12 cm box and the volumetric weight drops to under 0.6 kg.

Multiply that saving across a few hundred orders a month and the right box size pays for itself.

Step 5: Fill the gaps and seal it properly

Empty space is where damage happens. Fill gaps with crinkle paper, honeycomb paper or air pillows so the product cannot move when you shake the box. Seal the bottom seam with an H-pattern of tape (along the centre seam and both edges) for heavier parcels.

Step 6: Brand the outside

A plain box gets the product there. A printed box gets the customer to remember who sent it. Even a one-colour logo on brown kraft adds instant recognition, and full-colour printing turns every delivery into an advert that sits on someone's doorstep. Order printed boxes in your two or three most-used sizes first, then expand once you know what sells.

A packing station checklist

• Two or three standard box sizes that fit most of your products
• Filler material within arm's reach
• Strong tape and a dispenser
• A small scale and a measuring tape
• Printed inserts or thank-you cards
• Labels with clear handling marks for fragile items

One last tip

Do a drop test before you order a thousand boxes. Pack one parcel exactly as a customer would receive it and drop it from waist height onto a hard floor, on a corner, an edge and a flat side. If the product survives, your box is ready. Once it is, you can order custom printed shipping boxes in the exact size you tested.