I have a tiny 5ft fridge in a 15sq ft kitchen. I barely have enough space in my frodge for my essentials, so what am i supposed to do with an ounce of something that came in a can? I’ll have to buy another can of it, which will now leave me with 2 ounces the next time. Home cookbooks call for ingredients to be used in the quantities you buy them in, because no one cares how much cream of mushroom you put in your casserole, or if you used 450g of green beans vs 700. I’m not wasting a storage container or valuable food space on a small amount of leftover ingredients that could have just gone into my dinner without anyone noticing. That seems much better than just letting it sit in my fridge for 2 weeks before being theown away