Shipping 5-litre liquid cleaners online: what the packaging adds to your courier bill

A 5-litre can of floor cleaner is a heavy little parcel. The liquid alone weighs about 5 kg, and the courier has not yet seen the can or the carton.

Here is the short answer. Pack the can upright in a carton that fits it, put a second seal on the cap, and close the can inside a polybag with a little absorbent paper. In a carton that fits, the can is billed on its actual weight, not its size, at the usual express divisor of 5000. So the can, the carton and every leak layer add grams straight to your bill, and the liquid has already used up most of the weight.

Before you price any of this, check whether your cleaner is a dangerous good. Some couriers will not carry it at all.

At Jagannath Polymers in Jaipur, we have been making packaging since 1997: BOPP tape, stretch and shrink film, and paper packaging. We do not make cans or cartons. For the two heaviest parts of this pack, I have nothing to sell you, which makes it easier to be straight about them. We have supplied packing materials to a cleaning-liquid maker, but our group's online store does not ship liquids itself. So every courier rule below comes from the couriers' own pages.

The general rules are in our guides on volumetric weight and reading a courier rate card. Here we stay with the 5-litre can, and we end with a costing sheet you can fill in with your own quotes.

First check: will your courier carry your cleaner at all?

Do this before you design a single carton. If I were starting to sell a cleaner online, the safety data sheet would be the first paper I asked the manufacturer for, before any carton quote.

Some household cleaners count as dangerous goods for transport. An acid toilet cleaner may be a corrosive. A bleach product may be classed too. A solvent-based cleaner may be a flammable liquid. A plain floor cleaner or hand wash may be none of these.

It depends on the formula and its strength, not on the name on the label.

India Post publishes the definitions of the nine classes used in the IATA Dangerous Goods Regulations. Corrosives are defined by what they do when they leak: they can badly harm living tissue, other cargo or the vehicle itself by chemical action. A leak is exactly what we are trying to prevent here, so you can see why couriers worry.

Let us look at what the couriers' own pages say. I checked each of them on 26 October 2026.

1. Blue Dart's dangerous goods page says dangerous goods are not accepted on Blue Dart Express and Blue Dart Aviation services. Flammable liquids and corrosives are both on its list. Section 12 of its conditions of carriage also refuses anything IATA classes as dangerous goods on its Surface service.
2. Blue Dart's banned commodities page puts liquids and semi-liquids on the list for all its services, with a footnote that conditions apply and some items can be cleared under its security and operational norms. So even a mild floor cleaner needs a yes from them first.
3. Delhivery's restricted items page, updated 13 May 2025, warns that shipping a restricted item may lead to seizure, disposal and heavy penalties for the seller. The list itself is on that page.
4. India Post's prohibited items page, updated 19 October 2026, bars any "explosive, inflammable, dangerous, filthy, noxious or deleterious substance".
5. Shiprocket's support page on prohibited items, last modified in November 2020, lists bleach and industrial solvents among dangerous goods.
6. Amazon's seller guide to dangerous goods in India, from August 2025, names cleaning liquids among the products that may be classified as hazardous. It asks sellers to submit a safety data sheet or an exemption sheet for any product suspected to contain hazardous material.

We can take two more things from these pages.

First, a list is only a guide. Blue Dart says its list is not exhaustive and points to the IATA regulations for the full one. A cleaner that is missing from a list is not automatically allowed.

Second, the decision sits with you. IATA's own page on the regulations says they place the responsibility for correct classification on the shipper. For your parcels, the shipper is you, not the courier and not the aggregator.

The answer sits in the safety data sheet (SDS, also called the MSDS) for your product. Ask your manufacturer or chemical supplier for it. In the standard 16-heading layout, section 14 is Transport information. It gives the UN number, the transport hazard class and the packing group where they apply. Ireland's Health and Safety Authority explains these headings in a short information sheet from November 2023.

I am not a chemist, and I will not guess whether your formula is a dangerous good. If section 14 shows a UN number, take the SDS to your courier and get their answer in writing before the first dispatch. If they say no, nothing in the rest of this article will change that.

What does a packed 5-litre can weigh?

Let us start with the liquid. Water weighs about 1 kg per litre, so 5 litres of a water-based cleaner weighs about 5 kg.

Your cleaner may be heavier or lighter than water. Section 9 of the SDS, on physical and chemical properties, is where to look for its density or relative density. Multiply 5 litres by that figure.

There is an easier way, and it needs no paperwork. Weigh one filled can and one empty can on the same scale. The difference is your liquid.

Then add everything else: the empty can with its cap, any second seal on the cap, the polybag and paper, the carton and the tape.

It works like the baggage allowance on a flight. The airline weighs your suitcase with everything in it, and the suitcase itself eats into the allowance.

Here the 5 kg of liquid is the product. You cannot change it. The packaging grams are the only part of the weight you can work on.

Does the size of the box matter for a 5-litre can?

On an express service, usually not. On some surface services, it can. Let us check both.

Amazon.in's fees page and Delhivery's help page both work out volumetric weight as L × B × H in cm ÷ 5000, and both bill on whichever weight is higher.

At that divisor, a carton has to be bigger than 30,000 cm³ (that is 6 × 5000) before its volumetric weight goes above 6 kg. Measure yours. A carton that fits a 5-litre can closely will usually be well under that, and then the actual weight decides the bill.

Surface can be different. Blue Dart's conditions for its Surface service count every cubic foot, taken as 30 × 30 × 30 cm, as 10 kg. On that rule, a 30 × 20 × 34 cm carton counts as about 7.6 kg. That is heavier than either packed can in the worked example below.

So on a surface service with a rule like this, box size decides the bill again, and a carton one centimetre smaller each way may save a slab. Work out both weights for every service you book.

Which slab line is your parcel close to?

You will not stay under 5 kg. The liquid has already taken that.

So the real question is which side of the next line your packed parcel lands on.

On a rate card with 500 g slabs, the lines after 5 kg sit at 5.5, 6.0 and 6.5 kg. India Post's Speed Post parcel table, effective 1 August 2026, has rows up to 4,001 to 5,000 grams and then a row for each additional kilogram. A parcel just over 5 kg moves onto that additional-kilogram row.

This is why I would set a packaging budget for each product before choosing a single material.

Packaging budget = the slab line you want to stay under − the weight of the liquid

Let us take a cleaner with a relative density of 1.03, the same figure we use in the worked example below. Its liquid weighs 5.15 kg. Under a 6.0 kg line, the can, the cap seal, the bag, the absorbent, the carton and the tape must all fit inside 850 g.

That is the whole budget. A heavier carton grade, or a few extra sheets of paper "just to be safe", can use up the last of it without anyone noticing, until the bill comes.

What does each leak layer do, and what does it weigh?

The cap is the only opening in a closed can, so most of the layers we list here exist to protect it. Weigh each one, because each one comes out of your budget.

1. A second seal on the cap. The lowest-cost one is a strip of tape over the cap and down both sides of the neck. It only stops the cap turning, and it does not seal the mouth.
2. A shrink band, the next step up. It is a short sleeve of film shrunk tight over the cap and the neck. It helps hold the cap in place and shows whether anyone opened it.
3. An induction seal, a foil liner sealed onto the mouth of the can at filling. It closes the mouth itself. It needs a sealing machine where the cans are filled, so it is a decision for whoever fills them.
4. A closed polybag around the whole can. If the can seeps, the liquid stays in the bag and the carton stays dry. Corrugated board gets weak when it gets wet, and a wet bottom flap is now holding up 5 kg. Close the bag with a heat seal or with tape, never a loose knot.
5. Absorbent paper in the gaps. Crumpled kraft paper soaks up a small water-based seep and stops the can sliding about. It will not hold a burst can, and it adds grams, so use only as much as fills the empty space.
6. A carton built for about 6 kg. Ask your box maker to put the ply, the paper grade and the burst strength in writing. Whether 3-ply is enough or you need 5-ply depends on your can, your routes and how parcels are stacked in the van, so test it rather than assume.
7. Tape on the carton. The bottom flaps carry the whole parcel every time someone lifts it. Tape the centre seam and both edge seams on the bottom, in an H, with tape wide enough to grip both flaps well. We make BOPP tape, so take this as the tape maker's bias if you like, but the bottom seam of a 6 kg carton is the wrong place to save a few paise.
8. A snug fit. The can should not move when you shake the closed carton. Print "this side up" on the carton by all means, but plan for the parcel to spend some of its trip on its side, because you cannot control how it is loaded.

I will be honest about one thing. Every layer adds a few rupees and a few grams, and putting all of them on every can is not automatically right. Add them one at a time and watch what happens to your leak complaints. If I could afford only one, I would start with the polybag, because it keeps a small seep away from the carton. The calculation below shows how to decide on the rest.

Three checks before your first dispatch

Do these before the Diwali cleaning season, not in the middle of it.

1. The overnight test. Pack three cans exactly as you will ship them. Leave one upright, one on its side and one upside down on newspaper overnight. In the morning, open all three and check the bags and the newspaper for any wet patch.
2. The drop test. Drop a packed carton onto a hard floor on a bottom corner, then a bottom edge, then flat on its base. Stand clear, because 6 kg lands hard. Open it and look at the cap and the bottom seam.
3. The scale test. Weigh 10 packed parcels and write down the heaviest, not the average. I would treat any product within 100 g of a slab line as at risk, and find grams there first.

What does one leaked parcel cost?

More than the can. A leaked delivery often ends in a refund or a replacement, freight both ways and time on the phone. Our worksheet on what a damaged delivery costs shows how to add those lines up.

A leak adds two lines of its own.

1. A part-empty can cannot be sold again. The liquid that escaped is gone, even if the can comes back looking fine.
2. Liquid travels. A leaking 5-litre can may wet other parcels in the same bag or van. Read the clause in your courier agreement about damage your shipment causes, so you know who pays for that.

If your cleaner turns out to be a restricted item, the cost is not a refund. On Delhivery's own page, it can be seizure, disposal and a penalty.

Your calculation

Every figure here is an ASSUMPTION, chosen only to show the arithmetic. None of them is a courier rate, a market price or a measurement of a real can. Put your own weights and quotes in their place.

Let us say we sell a floor cleaner in 5-litre cans, and we are choosing between two packs.

1. Our cleaner has a relative density of 1.03 (assumed).
2. Our carton is 30 × 20 × 34 cm outside (assumed), so 20,400 cm³.
3. Our courier uses a divisor of 5000 and 500 g slabs, and charges ₹30 for each extra 500 g (assumed).
4. We ship 1,500 cans a month (assumed).

First the weight:

Both of our packs bill as 6.0 kg. In this example, all the extra protection in Pack B costs us nothing in freight.

Then the money, per order, with our assumed costs:

Freight is the same in both columns, so I have left it out. Pack B saves us ₹6 per can. At 1,500 cans, that is ₹9,000 a month.

Now change just one number. Say our cleaner has a relative density of 1.05, not 1.03. The liquid now weighs 5.25 kg.

Our Pack A weighs 5.77 kg and still bills as 6.0 kg. Our Pack B weighs 6.03 kg and bills as 6.5 kg, one extra slab of ₹30. On packaging, leaks and that extra slab together, Pack B now costs us ₹69 a can against Pack A's ₹45.

Being 30 grams over the line turned a saving of ₹6 into a loss of ₹24 on every can we ship.

In that case I would not throw away the bag. I would look for 30 g in the carton grade or in the paper, and test again. Our guide to downgauging explains how to trial a lighter material without losing the strength you need.

There is one more test we would run on any heavier pack. It pays back on leaks only if it cuts your leak rate by more than its extra cost ÷ the cost of one leak. Here that is ₹14 ÷ ₹1,000, i.e. 1.4 percentage points, so our Pack B must bring leaks from 2.5% to below 1.1%. In this example, if your leak rate were already below 1.4%, Pack B could not pay back on leaks alone, and one cheap layer would be the better place to start.

Here is the costing sheet. Keep one per product, and fill in the last column with your own figures.

Do line 1 for every product you sell in 5-litre cans. A phenyl, a dishwash liquid and a toilet cleaner may not weigh the same in the same can, and each one gets its own budget.

Start with one can this week. Weigh it filled, weigh it empty, and write down your packaging budget under the next slab line. If you want a second pair of eyes on the numbers, send us your can size, packed weight and slab size through the contact page.