ei matpakke · packed lunch
Feminine (ei)
Indefinite singular
ei matpakke
Definite singular
matpakka
Indefinite plural
matpakker
Definite plural
matpakkene
Feminine nouns (ei) can always be written with en as well: ei bok, boka or en bok, boken. Both are correct Bokmål.
How to guess the gender Nouns: gender and articles