The unusual cut of the ‘Twister’ models allows a huge expansion of the bag volume. A second plug lock allows the closure of the main compartment even with maximum filling. The two side zippers provide comfortable access to the contents. Some models offer the possibility to carry them as a backpack as well as only with a simple shoulder strap as a messengerbag by plugging the snap hooks. The bag bodies are made of particularly robust cowhide leather, a cotton-based tent fabric and combined with saddlery leather straps. Over time, the leathers develop a patina that additionally protects them from dirt and moisture.