Any mummies using the packit cooler bag to transport milk from work back home ? Is it good ?

Hi I used the cooler bag previously and has no complains about it. Basically it was able to keep my bm fresh for at least 6 hours. I pumped twice at work and at that time, my office fridge broke down and I had to depend on packit cooler bag. At first I Thot I had to buy extra blocks of ice bags to cool it but surprisingly it is able to maintain the temp even after 6 hours. However, another one of my colleagues chose a cheaper version. She bought ice packs from Daiso and put in her insulator free Nestle bag and it works well for her too.