I always have a compact umbrella in my bag.
15 eur here.
Now in eco-friendly fluoride-free fabric. Compact and incredibly durable. The frame is made of a rigid aluminum alloy that holds its shape. The umbrella cloth rotates to ward off wind, so it can be used safely even on windy days. Detachable strap keeps you from losing the umbrella bag. With a reflector on the drawstring. Handle is designed to fit comfortably. Strap length: 22 cm. Length of rib bone: 55 cm. Length at the time of folding: 22 cm. 100% Polyester.