My meeting in Barcelona finished at 5pm. My flight home wasn't until 21:55, which left nearly five hours in a small terminal with a coffee I didn't need and a departure board that wasn't moving.

I've written before about why more airports should have wellness facilities. It's the idea that a delayed flight or a long wait is a perfect window for a workout, if only the infrastructure existed. Barcelona Airport doesn't have a pool. But a quick search told me there were hotels and a beach club within a short taxi ride of the terminal that do.

I was sitting there with no swimsuit and no Wet Bag, so that was that.

The thing is, I'd only gone for the day.

If it had been a two-night trip, the Wet Bag would have been in my carry-on without a second thought, it always is, but a day trip feels different. I've done a lot of business travel and you pack light, you pack for the meeting and anything beyond that doesn't make the cut.

The Wet Bag weighs almost nothing and takes up no meaningful space. You genuinely don't notice it's there until the moment it becomes exactly what you need.

It's designed to keep wet kit completely separate from everything else in your bag and that's what makes a spontaneous swim actually possible: the hotel pool you didn't plan for, the beach you pass on the way back from a meeting, the hour that opens up between finishing work and catching a flight.

Without it, none of those moments work. A wet swimsuit can't go in a laptop bag. The opportunity closes and you sit in the terminal instead.

Day trip or five nights away, the Wet Bag takes up the same space, which is to say almost none at all. It just lives in your bag. And one day, on a warm Barcelona evening with hours to spare and a beach club 25 minutes from the airport, you'll be very glad it's there.

Pack your Wet Bag in your carry on, even on a day trip. Especially on a day trip.