Is duffel a word in the Scrabble Dictionary

Yes, duffel is playable

...and is worth 15 points.

Found in the following dictionaries

Enable (Words with friends)
SOWPODS (Collins Scrabble Words)
OTCWL2014 (NASPA Word List 2014)
TWL06 (NASPA List 2006)

"Duffel" Definition

noun

A blanket fabric made of low-grade woolen cloth with a nap on both sides.
Clothing and other personal gear carried by a camper.
A coarse heavy woolen material with a thick nap.
Transportable personal belongings, equipment, and supplies.