Bundle
Package, Parcel
noun
Something that you wrap is a bundle or package.
Since this word consists of a kanji with hiragana attached, you can bet that it will use the kun'yomi reading. You learned it when you learned 包む, but here's a reminder of the mnemonic just in case:
Remember how you wrap your bundles? That's right, with the two two technique. Your packages are always double wrapped.
日付が変わる瞬間に包みを開けてもいい？
Is it okay if I open this package at the stroke of midnight?