How Heavy Are The Different Step Stools, Notably Rockford (Costco)

How heavy are the different step stools, notably Rockford (Costco) HN-CSE 147, Costco chair step stool w lift up seat, Rockford 17.91L, 25.98W, 44.09H. Weight matters. But also appearance matters. We are old and fragile. We live in a small area with tall bookcases. We can't be lifting things about, but we'd like some visual harmony. And accessibility.