Filler (packaging)
WordNet
noun
(1) The tobacco used to form the core of a cigar
(2) Anything added to fill out a whole
"Some of the items in the collection are mere makeweights"
(3) Copy to fill space between more important articles in the layout of a magazine or newspaper
(4) 100 filler equal 1 forint in Hungary
(5) Used for filling cracks or holes in a surface