As much as a poetry collection can be "about" anything, this book is "about" unrequited love and the death of two friends. The weights of life, love, existence, mortality. The weight of getting older. And also "the waits" of life, love, existence, mortality. The weight of waiting for things to happen in life.
Norris, Ken, "Weight" (2015). Faculty and Staff Monograph Publications. 261.