I am trying to find a good hands on lesson plan on the concept of weight for first graders?

I am teaching summer school and it is first grade math. We are doing measurement this whole week and I would like to touch and do a very basic introduction on weight, however, I cannot find a good lesson plan that will work. Most lessons want you to have a balance scale, problem is, I don't have access to one. I thought about having various objects and having them guess which one would be heavier and then lifting them up to see if they were right, not sure how successful that would be. Any ideas or suggestions would be appreciated.