PERSI produces secure handbags, backpacks and cases. The product's based on electronic locks to provide smart privacy experience.
The brand is about privacy and personality, fashion and technology meetup. 
A "locking frame" is the first brand symbol. It differs, it transforms. But essentials are always the same.
The actual product misses a physical lock, just as a very important connotation. So, the symbol of a lock provides the right feeling.