I put packing material in the gaps inside the box so the product wouldn't move.
I stuffed the turkey and roasted it in the oven.
I had a filling put in for my cavity.
詰め物 means stuffing or packing material used to fill a gap, while 詰め合わせ means an assortment of goods packed together for sale.
Standard kanji spelling.
Less common variant without okurigana.
Kana spelling; practical when the kanji are not needed.
Compound of 詰め (つめ, 'stuffing', continuative form of 詰める) + 物 (もの, 'thing').