Wet swimmers have a habit of soaking everything else in the bag. That’s exactly where a waterproof wet bag earns its place in a family swim kit.
Whether you’re heading to swimming lessons, the beach or the local pool, here’s how to choose the right wet bag size and use it effectively.
What is a wet bag used for when swimming?
A wet bag gives you a separate place to carry damp items after swimming. Instead of putting wet swimwear, swim nappies and towels straight beside dry clothes, you can keep the wet gear contained for the trip home.
Wet bags are also useful beyond swimming. Families use them for daycare clothes, toilet-training accidents, spare outfits and travel.
For a broader guide, read what is a wet bag?
Small or large wet bag?
The right size depends on what you want to carry.
A small wet bag is handy for compact items such as a reusable swim nappy, small swimsuit or spare clothes.
A large wet bag gives you more room for family swim days, larger swimmers or multiple wet items.
Shop small wet bags or shop large wet bags.
Can you put a wet towel in a wet bag?
You can use a larger wet bag for damp swimming gear, although capacity will depend on the size and thickness of the towel. For bulky family towels, you may prefer to reserve the wet bag for swimmers and swim nappies and carry towels separately.
Are wet bags only for cloth nappies?
No. Although wet bags are often associated with reusable nappies, they’re useful anywhere you need to separate wet or messy items from clean ones. That makes them particularly practical for swimming, daycare and family travel.
What should go in a swimming wet bag?
- Wet swimwear
- Reusable swim nappies
- Damp small towels
- Wet rashies
- Clothes after water play
Keep dry clothes outside the wet bag so they’re ready when you need them.
For more than one child, use the clean-and-wet system for a family pool bag to organise individual changes and decide whether separate wet loads work better than one overfilled bag.
Build an easier swimming routine
Pairing a wet bag with the rest of your child’s swimming essentials means less sorting at the pool and fewer damp surprises when you unpack at home.
Explore Sarah Jane Collection waterproof wet bags, or browse swim nappies and wet bags together.
A practical 25 × 20 cm vs 40 × 30 cm pack test
Use the actual items you plan to carry, not a fixed capacity promise. In the small 25 × 20 cm bag, try your child’s swim nappy and compact swimmers first. In the large 40 × 30 cm bag, try those items plus any additional clothing. If the zip needs forcing or a bulky towel takes all the space, carry the towel separately.
The Blue Whale wet bag has both size options. Choose small wet bags for compact loads or large wet bags when you need more room. Dimensions are approximate; fabric thickness, folding and the number of items change what fits. Wring out damp gear first and do not use either size for free-standing water.
A wet bag contains wrung-out gear; it is not a submersible dry bag. Our wet bag vs dry bag guide explains which category suits each packing job.
The whole bag changes with the outing as well as the wet load. Our beach and swimming lesson packing comparison shows how to keep a shared kit and add the right extras.
After the trip home, use our wet bag washing and drying guide to empty, clean and fully dry the bag before the next swim.