Bring a cooler bag with lots of ice packs. Back when there was no designated fridge for pumping mum’s BM, I put my EBM inside a plastic box before putting in the shared fridge. Then when it’s time to go home, I take the EBM out and into my cooler bag with ice packs. (I put the ice packs in a square plastic container and put in the freezer during working hours)
Cooler bag and out coolant inside the bag