Melbourne kickstarted company that makes an amazing electronic padlock. I have two already and will be getting two more as a Xmas gift.
I think if you just watch their video you will be convinced to get one for yourself.
I use the lock for my main travel overseas but also daily on my backpack. You can control the lock with your smartphone, button pattern combination, have proximity alarms, the USB chargeable lasts a year and you can use the app to unlock it from the other side of the world. Basically it is a very well thought out lock and is worth the price IMHO.
At the 40% off price (need to purchase 2 or more), this is the cheapest I have seen it so far.
$110 each? Wow