MontiiCo Insulated Lunch Bag Size Guide: Which Size Is Right for Your Child?

If you have ever looked at a MontiiCo lunch bag wondering "will my kid's lunch box actually fit in there?" — you're not alone. It's one of the most common questions we get here at Coastal Kidswear, and honestly, it's a fair one. Getting the size wrong means a frustrated morning trying to cram everything in.

This guide takes the guesswork out of it completely.

MontiiCo offers three insulated lunch bag sizes — the Mini, the Medium, and the Large — and each one is designed with a specific setup in mind. Here's everything you need to know to choose the right one.

MontiiCo Mini Insulated Lunch Bag

Inside dimensions: 14cm x 17.5cm x 6cm Outside dimensions: 15cm x 18.5cm x 7.5cm Internal volume: 2L (approx. 8 cups of food) Weight: approx. 305g (including ice pack)

The Mini is the smallest bag in the MontiiCo range and it's absolutely perfect for the tiniest lunch-packers. Whether it's a daycare snack bag, a half-day kindy setup, or just a little one who doesn't eat a huge amount yet, the Minikeeps things compact, light, and easy to carry.

Best suited for: Babies, toddlers, and daycare-aged children (6 months–3 years), very small eaters, or as a dedicated snack bag.

What fits inside the MontiiCo Mini Lunch Bag:

• A small snack container or MontiiCo Snack lunch box + small ice pack
• A single food jar + small ice pack
• A couple of bento cups or snack portions alongside a small container
• Light enough that little ones can carry it themselves

With around 2 litres of internal space (roughly 8 cups of food), it holds just the right amount for a small appetite — without the bulk of a bigger bag getting in the way.

Like all MontiiCo bags, it's machine washable and insulated to keep food fresh, which is a lifesaver when you're dealing with daycare drop-offs and mystery smells.

MontiiCo Large Insulated Lunch Bag

Inside dimensions: 29cm x 23.5cm x 7.5cm Outside dimensions: 30.5cm x 24.5cm x 10cm Internal volume: 5.1L (approx. 21.5 cups of food) Weight: approx. 820g (including ice pack)

The Large is MontiiCo's most popular bag, and it's easy to see why. It's the go-to choice for primary school kids who need a full lunch setup — think lunch box, food jar, ice pack, and a drink bottle — all packed together without a game of morning Tetris.

Best suited for: Primary school children (Kindy through to Year 6), bigger appetites, and anyone packing multiple items.

What fits inside the MontiiCo Large Lunch Bag:

• MontiiCo Feast Lunch Box + ice pack
• MontiiCo Bento lunch box (any size) + food jar + ice pack
• A 350ml or 475ml MontiiCo drink bottle alongside your lunch box
• Standard-sized ice pack (MontiiCo Large Ice Pack fits perfectly)

The Large bag is machine washable, built tough for daily school runs, and designed to keep food cool for up to 8 hours — which matters a lot here in Australia, especially through Terms 1 and 4.

MontiiCo Medium Insulated Lunch Bag

Inside dimensions: 21cm x 23.5cm x 6cm Outside dimensions: 22cm x 24.5cm x 7cm (including handle) Internal volume: 3.70L (approx. 14.5 cups of food) Weight: approx. 415g (including ice pack)

The Medium is the perfect fit for pre-schoolers, kindy kids, and smaller eaters who don't need a big setup. It's compact enough to slip easily into a kindy bag or mini backpack, without all that extra bulk.

Best suited for: Pre-school and kindy-aged children (2–5 years), smaller eaters, or anyone packing a single lunch box without extras.

What fits inside the MontiiCo Medium Lunch Bag:

• A single MontiiCo Bento lunch box + small ice pack
• MontiiCo Snack lunch box + food jar
• Ideal for shorter days where a lighter pack is all that's needed

Like the Large, it's machine washable and insulated to keep food fresh and safe — no soggy lunches, no warm fruit salad.

Mini vs Medium vs Large: Quick Comparison

Frequently Asked Questions

What lunch boxes fit in the MontiiCo Large Lunch Bag? The Large bag is designed to fit the full MontiiCo lunch range including the Feast Lunch Box, all Bento sizes (Bento 2, Bento 3, Bento 5), and a food jar alongside. You can also fit a small drink bottle depending on how you pack it.

What's the difference between the MontiiCo Mini, Medium, and Large lunch bags? Size and capacity.

Mini (14 x 17.5 x 6cm inside, 2L) is designed for babies, toddlers, and daycare snack bags. 

Medium (21 x 23.5 x 6cm inside, 3.70L) suits pre-schoolers and kindy kids with a single lunch box setup. 

Large (29 x 23.5 x 7.5cm inside, 5.1L) is the full-kit bag for primary school kids who need lunch box + food jar + ice pack all in one place.

What's the difference between the MontiiCo Large and Medium lunch bags? Mainly volume and length. The Large holds 5.1L (around 21.5 cups of food) and gives you room for a full lunch setup with multiple items, while the Medium holds 3.70L and is better suited to a single lunch box — ideal for pre-school and kindy-aged kids.

Can I fit a MontiiCo drink bottle in the lunch bag? Yes! A 350ml or 475ml MontiiCo drink bottle can fit alongside a lunch box in the Large bag. For bigger bottles (700ml+), pop those in a side pocket of the backpack instead.

Are MontiiCo lunch bags machine washable? Yes — all three bags (Mini, Medium, and Large) are machine washable. This is honestly one of the best things about them. Lunchboxes can get messy, and being able to throw the bag in the wash makes a big difference. Just let it air dry and it's ready for the next day.

How long do MontiiCo bags keep food cold? MontiiCo insulated lunch bags are designed to keep food cool for up to 8 hours when used with the included ice pack especially through our hot Australian summer.

Will the MontiiCo lunch bag fit inside a school backpack? The Large bag is designed to slot neatly into most standard-sized school backpacks, and the Medium fits easily into smaller kindy bags and mini backpacks. If you're unsure, check our Lunch Bag Size Chart for a full comparison.

Still Not Sure Which Size to Choose?

Here's the simple version: if your child is school-aged and packing a full lunch with a large lunch box, snack box or food jar, and ice pack — go with the Large. If you've got a pre-schooler or kindy kid with a medium lunch box — the Medium is the sweet spot.  And for babies, toddlers, and daycare snack runs — the Mini is just right.

All three bags are built to last, machine washable, and available in MontiiCo's gorgeous range of prints so your little one can carry their lunch in style.

👉 Shop MontiiCo Lunch Bags at Coastal Kidswear

Have a question we haven't answered? Get in touch with our team — we're always happy to help you find the right fit.