Picture someone down from a train in a town where nobody knows them, holding one cheap bag sewn from carpet cloth. Everything they own is inside it. They did not come to settle, plant anything or stay. They came because this place has something to give out, and the bag is light enough to carry away again the moment it stops giving. Every use of the word keeps that in view: no roots here, and one hand already on the handle.
From the word’s history
The word is built from carpetbag plus -er, the ending for a person who does something. A carpetbag was a cheap travelling bag made of carpet fabric, and the source notes that many of these arrivals carried their belongings in one.
這個字由 carpetbag 加上 -er 組成，-er 指做這件事的人。carpetbag 是一種用地毯布做的便宜旅行袋。來源說明指出，當年這些外來者常常就用這種袋子裝全部家當。所以字面上它說的是「提著地毯布袋的人」，那只袋子也就成了整個字的畫面。
Wiktionary, "carpetbagger"
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