All right.  I know this is cheating to claim a whole series for one of my top 20 “must pack” books, but this is my blog and I can do what I want.  John MacArthur and I disagree on some things, especially in regard to the ministry of the Holy Spirit today.  However, his commentaries are consistently my “go to” for in-depth and yet practical biblical exegesis.  No fluffy stuff here, just good biblical scholarship.  I am a better student of the Bible because of his commentaries.  Therefore, his set of commentaries makes the cut of 20 “must pack” books.