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Uniqlo Round Mini Shoulder Bag ($20)

"I know this bag is everywhere, but it really does it all. I have it in a bright yellow color, and I grab it on weekends because it can fit all the things my kids need, from diapers to snacks. When I'm traveling, I like having a crossbody that lets me easily access my passport and other airplane essentials," Wu says.

The bag, which is made from a naturally wrinkled nylon and comes with an adjustable strap for a sporty look, also comes in 11 other shades and is water-repellent for convenience. It's truly the perfect size for someone on the go who needs to be hands-free.