Delta Sling Triangle Emboss. Donâ??t call it a fanny pack. Or do, and be proud. This cross-body sling also loves to be worn around your waist. We canâ??t promise a slimming effect, but we can wax poetically about its ease of use while cycling, skating, and standing around. Designed to carry layers, lunch, and possibly a camera for filming your buddies bombing downhill, the Delta owns it in high and low locales.