At first I was sceptical due to high price. Cause I am from Malaysia, so after currency exchange it will be expensive. But it totally game changing. I no longer need to bring ice pack to work. I usually bring 2x500g ice pack. That's a total of 1kg. I also bring 2L water in my bag. So my working bag will be sooo heavy. By converting to this system, my bag is lighther and no longer experiencing shoulder pain. On top of that, I can still use this if I still no longer BF.