noun
packing material; wadding; padding
General term for material used to fill gaps, cushion, or pack items.
箱の中に込め物を詰めて、商品が動かないようにした。
I packed wadding into the box so the product wouldn't move.
noun
In printing, pieces of wood or metal used to fill blank spaces in a form.
活版印刷では、込め物を使って版面の余白を埋める。
In letterpress printing, furniture is used to fill the margins of the form.
詰め物 is more common for stuffing, filling, or dental fillings, while 込め物 emphasizes packing or padding material.
Compound of 込め (from verb 込める 'to put in, pack') + 物 'thing'. The exact historical derivation is uncertain.