During my round-the-world trip, I used a wire mesh to protect my backpack from theft. I wrapped a stainless steel mesh around my backpack and locked it with a padlock (wrapping it around a pillar is even more effective, and it actually helped me out several times) to protect it from pickpockets, theft, and snatch-and-grabs. The wire has no scratches or stains. This is a used item, so please only purchase if you understand this. Pacsafe 55 55L ¥11,000 (tax included) Specs: Capacity: 22-55L Weight: 500g Size: 14x12x5cm Material: Stainless steel The Pacsafe 55 wraps backpacks and duffel bags in a stainless steel mesh, supporting safe travel at all times. The durable and expandable design can be used with mainstream-sized backpacks and soft luggage bags. You can choose from 4 sizes to suit your needs, such as travel experts who use small bags, long-term travel such as outdoor and adventure travel, divers, paragliders, and other adventures that use gear. For packs of approximately 25-55L. Anti-theft features: ● 360° eXomesh locking system