If there's one thing parents learn very quickly, it's that a bag is never just a bag.

One day, you need somewhere to keep your child's spare clothes.

The next, you're carrying wet swimwear or looking for convenient storage for your baby carrier. 

Then there's the preschool nap blanket, snacks, toys, shoes, gym clothes, travel essentials — and somehow, you're still expected to have one hand free.

That's exactly why we created Coastberry's Multi-Purpose Waterproof Bags.

Designed as an all-in-one everyday solution, these spacious, durable bags are made to adapt to whatever your day throws at you.

Diaper bag? Absolutely.
Preschool sleeping bag? Yes.
Travel organiser? Of course.
Swimwear and wet clothes? Perfect.
Gym or fitness bag? Why not?
Grocery carryall? Definitely.

And because practical doesn't have to mean boring, ours come in playful designs that little ones actually love — from unicorns and marine animals to princesses, corgis, swans, ballerinas and more.

What is a multi-purpose waterproof bag?

A multi-purpose waterproof bag is designed to provide added protection for the belongings inside while being versatile enough for different everyday uses.

Unlike a bag designed for only one specific purpose, a multi-purpose bag can move between different parts of your routine.

Today it might be your child's preschool bag.

Tomorrow it could hold swimming gear.

Next weekend, it might become your travel organiser or your trusty companion to your hyrox and pilates classes.

The idea is simple:

One well-designed bag. Multiple uses. Functional and economical. Less clutter.

Coastberry's Multi-Purpose Waterproof Bag is designed specifically with everyday family life in mind, combining a spacious 10-litre capacity with a durable double-lined construction and practical carrying options.

What makes Coastberry's waterproof bag different?

We wanted to create something that was genuinely useful — not another bag that only looks cute in photos.

The Coastberry Multi-Purpose Waterproof Bag combines several practical features into one compact design.

Double-lined construction

The bag is double-lined for added durability and water resistance, giving it a more substantial construction for everyday use.

Spacious 10-litre capacity

Despite its convenient size, the bag offers a generous 10-litre capacity, giving you plenty of room for everyday essentials.

Large zippered main compartment

The main compartment provides ample storage while keeping your belongings securely enclosed.

Zippered side sleeve

A separate zippered side sleeve gives you additional storage for smaller items that you want to keep easily accessible.

Multiple carrying options

The bag features top handle straps as well as side handles with snap buttons, giving you different ways to carry and attach it.

Stroller-friendly design

The side handles can be used to conveniently attach the bag to a stroller, making it especially useful when you're out with younger children.

Convenient everyday size

At 27cm × 17cm × 22cm, it's large enough to be genuinely useful without becoming an unnecessarily bulky bag to carry around.

Watch our demo video here to find out more!

What can you use a waterproof bag for?

This is where the multi-purpose design really comes in.

1. Use it as a diaper or baby essentials bag

Parents with little ones know how quickly a seemingly simple outing can turn into a full packing exercise.

Spare clothes. Diapers. Wipes. Milk bottles. Snacks. Muslin cloths.Toys.

And somehow, always one more thing.

The Coastberry Multipurpose Waterproof Bag provides a convenient compartment for keeping baby and toddler essentials together — particularly useful when you don't want to bring your entire main diaper bag.

It can also serve as a secondary organiser inside a larger baby bag.

2. Use it as a preschool sleeping bag

For preschoolers, this bag can be especially handy for transporting their nap-time essentials.

Depending on your child's preschool requirements, you can use it to carry a sleeping bag, blanket, pillow or other rest-time items.

The spacious main compartment makes it easy to keep everything together, while the water-resistant construction provides some added protection against everyday spills and moisture.

And let's be honest — if the bag has a unicorn, ballerina or marine animal design on it, your preschooler may be considerably more enthusiastic about carrying their own things.

3. Use it for swimwear and wet clothes

This may be one of the most useful applications for a waterproof bag.

After swimming, you're often left with:

Wet swimsuit + wet towel + wet clothes + nowhere to put them.

Instead of putting damp items straight into your regular handbag or backpack, use our Multi-purpose Waterproof Bag as a dedicated wet-clothes carrier.

The double-lined construction provides added water resistance, helping to keep moisture contained while you're travelling home.

It's also a natural companion for your family's swim days and beach outings.

4. Use it as a travel organiser

Travelling with children often means packing a surprising number of small items.

The bag can be used to organise:

• Spare clothes
• Travel toys
• Snacks
• Toiletries
• Swimwear
• Baby carrier
• Shoes
• Baby essentials
• Activity materials
• Small travel accessories

Its 10-litre capacity gives you enough room to group related items together without taking up excessive space.

And because it has its own handles, you can easily lift it out of your luggage when you need it.

Pack it. Zip it. Grab it and go.

5. Use it as a fitness or gym bag

Multi-purpose doesn't have to mean child-related.

The bag also works beautifully as a convenient carryall for adults.

Use it for:

• Gym clothes
• Workout shoes
• Towels
• Water bottles
• Fitness accessories
• Change of clothes
• Personal essentials

The zippered compartments help keep your belongings organised, while the water-resistant construction is useful when you're carrying sweaty workout clothes or a damp towel afterwards.

For sure a trusty companion for your hyrox, gym, pilates sessions and more! 

6. Use it for grocery runs

Need a smaller carryall for a quick grocery run?

The Coastberry bag works for that too.

Its sturdy construction and generous capacity make it useful for carrying everyday purchases, snacks, pantry items or other essentials.

It's particularly handy when you need one extra bag but don't want to reach for a huge tote.

What size are the Coastberry waterproof bags?

Our Multi-Purpose Waterproof Bag measures:

27cm × 17cm × 22cm

With a capacity of approximately 10 litres, it offers a generous amount of storage while remaining a practical everyday size.

It's large enough for clothing, towels, preschool essentials and travel items, but compact enough to carry around without feeling like you're lugging another oversized piece of luggage.

What should I look for in a multi-purpose everyday bag?

If you're looking for a versatile everyday bag, consider:

1. Capacity

Is it large enough for what you actually need to carry?

2. Organisation

Are there separate compartments for smaller items?

3. Durability

Is the construction designed for regular use?

4. Moisture protection

Will it provide protection when you're carrying damp or wet items?

5. Carrying options

Can you carry it comfortably or attach it where needed?

6. Size

Is it spacious without being unnecessarily bulky?

7. Versatility

Can you use it for more than one purpose?

8. Design

Does this brand feature the most adorable brand-exclusive designs that are relatable to you and your family?

Our Multi-Purpose Waterproof Bags were created with those everyday moments in mind. Not to add another thing to your life, but to make some of those little things just a bit easier to manage. From the ordinary school days to weekend adventures, family holidays and everything in between, we hope it's a bag that quietly becomes part of your family's story — useful when you need it, loved for its little details, and there through all the growing-up years.