There are various technologies available that can detect if someone opens your backpack. One such technology is the electronic anti-theft backpack, which is designed to deter theft and protect personal belongings. These backpacks come with a variety of features and functions that can detect and alert the user if someone opens the backpack.

One common feature of electronic anti-theft backpacks is a built-in alarm system. When activated, the alarm will sound if someone tries to open the backpack without the user's permission. Some backpacks also come with a vibration sensor that will trigger the alarm if the backpack is moved or shaken.

Another feature of these backpacks is a built-in GPS tracker. This allows the user to locate their backpack if it is stolen or lost. Some backpacks also come with a mobile app that can be used to track the backpack's location and receive alerts if the backpack is opened or moved.

Many electronic anti-theft backpacks also come with RFID blocking technology. This blocks unauthorized scanning of RFID tags embedded in credit cards, passports, and other personal items. This helps to prevent identity theft and other types of financial fraud.

In terms of availability, electronic anti-theft backpacks are widely available for purchase online and in retail stores. There are many different brands and models available, each with their own unique features and functions. Prices can range from around $30 to several hundred dollars, depending on the brand and features.

One popular brand of electronic anti-theft backpacks is Bobby, which offers backpacks with built-in alarms, RFID blocking technology, and other security features. Another popular brand is Pacsafe, which offers backpacks with slash-proof construction, locking zippers, and RFID blocking technology.

Overall, electronic anti-theft backpacks are a useful tool for protecting personal belongings and deterring theft. They come with a variety of features and functions that can detect if someone opens your backpack, and some even come with GPS tracking and mobile apps. These backpacks are widely available and can be purchased at a range of prices, depending on the brand and features.