How heavy is optifast?

I'm starting optifast on Friday and I'm supposed to pick up 3 weeks worth at the hospital. I have a bad back so I'm wondering if it's really heavy to carry.

If I'm remembering right there are 2 boxes for each week. Make sure you bring shopping bags. There not heavy but awkward if your by yourself. It might be easier to take them out of the boxes and carry them individually in your shopping bags. Good luck.