Let's say I am carrying a couple of bags or something like that and some random stranger offers to carry one of them.

Do you want me to hold one of these?

I have seen in movies that if you don't have any problem with the bags you will most likely say I have got it, rather than saying No I don't or explaining how it is not a problem for you to carry the bags which is what I tend to do.

My question is that what else can I use besides this?