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.]

WordNet (r) 3.0 (2006):

duffel
    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]

Moby Thesaurus II by Grady Ward, 1.0:

38 Moby Thesaurus words for "duffel":
   accouterments, apparatus, appliances, appointments, appurtenances,
   armament, bag and baggage, baggage, conveniences, dunnage,
   equipage, equipment, facilities, facility, fittings, fixtures,
   furnishings, furniture, gear, impedimenta, installations, kit,
   luggage, machinery, materiel, munition, munitions, outfit,
   paraphernalia, plant, plumbing, rig, rigging, stock-in-trade,
   tackle, things, traps, utensils