I live 200 miles from home. If I go visit my parents, I take as little as possible with me, because I have to carry it on the train. While I'm there, they and my sister let me use shampoo, conditioner, toothpaste, hair drier, hair straighteners, socks (yes, I don't take socks - they have plenty), pyjamas (again, they have plenty), any items of clothing I'm missing (my sister and I have near-identical wardrobes anyway), sanitary products, food, drinks etc.
When my family and friends come to visit me, I would lend them all of those things. They usually don't borrow clothing etc. but I wouldn't bat an eyelid if they did. What's the point in packing a bag full of stuff when the person you're staying with has all those things? If you resent them being there and using your things, you shouldn't invite them in the first place.
Some people really need to realise that if they date a man/woman who has a child, that child is, or should be, that man/woman's priority over everything else in the entire world. If they can't handle the fact that their partner has responsibilities, they shouldn't be with them.