This $18 belt bag is a perfect tube for the everywhere a belt bag from Lululemon, except this one is actually in stock! I typically wear it as a sling bag Crossbody, but for this hike, I wore it as a fanny pack.

Commissionable links
Brooks Women's Run 1/2 Zip Long Sleeve Shirt | Academy | Academy Sports + Outdoors
Brooks Chaser 5" Short | Fleet Feet
ALTRA Women's AL0A4VR7 Lone Peak 5 Trail Running Shoe | Amazon (US)
Everywhere Belt Bag 1L | Bags | lululemon | Lululemon (US)
ODODOS Unisex Mini Belt Bag with Adjustable Strap Small Waist Pouch for Workout Running Travellin... | Amazon (US)
adidas Originals Women's Relaxed Fit Adjustable Strapback Cap 2020 | Amazon (US)