Why Diaper Bags Should Not Be Measured in Litres?

When shopping for a backpack or travel luggage, one of the first questions people ask is:

"How many litres does it hold?"

25 litres.
30 litres.
35 litres.

Bigger numbers often create the impression of getting more value for money. Over time, this way of thinking has quietly entered the diaper bag industry as well. But a diaper bag is fundamentally different from a travel bag. And perhaps that is where one of the biggest misconceptions about diaper bags begins.

Parenting Doesn't Happen in Litres

As a mother and as the founder of Motherly, one of the earliest questions we asked ourselves while designing our diaper bags was not:

"How much can this bag hold?"

Instead, it was:

"Can a parent find what they need within seconds while managing a baby at the same time?"

Because parenting outside the home is rarely a storage problem. It is an accessibility problem. A crying baby does not wait while you search through a large compartment for wipes. A hungry baby does not care whether your bag is 25 litres or 35 litres if the bottle is difficult to access. The real challenge is not carrying more. The real challenge is finding the right thing at the right moment.

What Parents Actually Need

A well-designed diaper bag solves dozens of small problems simultaneously:

A bottle that stays warm until feeding time.
Wet clothes that remain separated from dry clothes.
Diapers that are accessible instantly.
A secure place for keys, phone and wallet.
Dedicated pockets that eliminate searching and rearranging.
Comfortable carrying, even when the parent is also carrying a child.
These are not volume problems.
They are design problems.

Why Bigger Is Not Always Better

A larger main compartment certainly increases the bag's capacity. But capacity and usability are not the same thing. Beyond a certain point, larger bags become:

Heavier
Bulkier
More difficult to organize
Less comfortable to carry for long durations

And in the case of diaper bags, the person bearing that burden is usually already carrying something else that weighs considerably more — a baby.

The ideal diaper bag therefore is not the biggest bag. It is the bag that makes parenting feel lighter.

The Difference Between Storage and Convenience

Many products in the market are increasingly advertised using litre capacities because it gives customers an easy number to compare.

However, two bags with the same litre capacity can deliver completely different user experiences.

One may offer:

Multiple organized compartments
Insulated bottle pockets
Wet-dry separation
Easy one-hand access
Ergonomic weight distribution
The other may simply offer a larger empty space.
On paper they may look similar.
In practice they are entirely different products.

Designing for Parenting Moments

At Motherly, we have never designed our diaper bags around litre calculations.

We design around moments.
The vaccination appointment.
The visit to the park.
The family wedding.
The baby's first flight.
The emergency outfit change.
The spilled milk bottle.
The unexpected nap during travel.

Every compartment, every zipper and every pocket exists because somewhere a parent needed it.

The Question Behind the Question

One of the most valuable lessons in building consumer products is this: Customers often ask for specifications. Founders need to understand the problem hidden behind those specifications.

When a customer asks:

"How many litres is the bag?"

The question they are often really asking is:

Will this fit everything I need?
Will I stay organized?
Will I struggle to find things?
Will this make my day easier?

Those are the questions worth designing for. Because ultimately, a diaper bag is not a competition in litres. It is a competition in convenience. And perhaps that is the difference between making bags and designing for parents.