- Casually across the chest or practically around the hips: the HERMETIC sling bag fits just as perfectly as it protects against moisture and dust. The patented, automatically sealing closure is 100% tight. Be it on a city trip, a jump into a wild adventure, or discovering the world on the water with your SUP: The sling bag offers space for the most relevant things that are dear to you. In addition to a smartphone, important cards, charging cables and car keys are always with you. And the magnetic belt buckle can be easily operated with one hand.