We use lots of milk for Cappucinos etc in the coffee shop and have found that we can reduce the bulky plastic milk containers by pouring an inch or so of boiling water into the empty container, put on the lid, swill water all around including into the hollow handle, pour out the water and quickly roll up the container from the base (like a toothpaste tube) Then put an old elastic band figure of eight style around it to hold it tight. If you really want to save a lot of space, cut off the top of a container then place all of your previously flattened ones inside it. we reckon to get 8 – 10 2 litre containers into one.