The Collaborative International Dictionary of English v.0.48:

Duffel \Duf"fel\, n. [D. duffel, from Duffel, a town not far
   from Antwerp.]
   1. A kind of coarse woolen cloth, having a thick nap or
      frieze. [Written also duffle.]
      [1913 Webster]

            Good duffel gray and flannel fine.    -- Wordsworth.
      [1913 Webster]

   2. Outfit or suppplies, collectively; kit. [Colloq., U. S.]
      [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Duffle \Duf"fle\, n.
   See Duffel.
   [1913 Webster]

WordNet (r) 3.0 (2006):

duffle
    n 1: a large cylindrical bag of heavy cloth; for carrying
         personal belongings [syn: duffel bag, duffle bag,
         duffel, duffle]
    2: a coarse heavy woolen fabric [syn: duffel, duffle]