What can I use to store expressed breastmilk that’s pumped at the office until I come home.. which would be 3 hours after I pump? I would like to put them in a bag, not in the common refrigerator!

I would assume a cooler pack but all I see on amazon are the ones for the bottles.. are there any for breastmilk storage bags (like Lansinoh bags)?

Or will these contoured cooler packs fit spectra s1 bottles?

I am going back to work in a week, any suggestions are very helpful, thank you!