Porto Phone Pouch
If you can only have one bag (and which woman could EVER exist with just one bag??) then it would have to be the Porto phone pouch. Soo handy. Can fit your phone, your keys, your lipstick and AirPods and it's still as light as a feather. Great when you are exercising in the morning and especially handy when you take the dog for a walk. Plenty room for doggy treats. Comes in so many fun colours, it will be hard to choose just one.