I buy my cat litter and chicken feed in 50# bags, but my knees are not amenable to moving the beasts. I now keep empty cat-litter tubs in my car so I can break down the bags into smaller quantities. Not only is it lighter, but I can let the rest of the stuff sit out there until my next trip or whenever DD/DS get home!
So ... there's another "I'm so old" note. I'm so old that I remember when my adult children were so small that I had to carry THEM in from the car, too.
... ((( .. {{{ sigh ... }}} ... ))) ... (followed by a tiny, sad, smile)