Jamieson, Fausset and Brown on 2 Timothy 4:13

13. cloak ... I left--probably obliged to leave it in a hurried departure from Troas.

Carpus--a faithful friend to have been entrusted with so precious deposits. The mention of his "cloak," so far from being unworthy of inspiration, is one of those graphic touches which sheds a flood of light on the last scene of Paul's life, on the confines of two worlds; in this wanting a cloak to cover him from the winter cold, in that covered with the righteousness of saints, "clothed upon with his house from heaven" [Gaussen]. So the inner vesture and outer garment of Jesus, Paul's master, are suggestive of most instructive thought (Joh 19:2).

books--He was anxious respecting these that he might transmit them to the faithful, so that they might have the teaching of his writings when he should be gone.

especially the parchments--containing perhaps some of his inspired Epistles themselves.