Un sac (masculine noun) de couchage.
The French word "sac" is masculine.
sac de couchage
masculine: le sac à dos
"Sac l'école" is masculine in French. The word "sac" (bag) is masculine, so it determines the gender of the entire phrase.
The word "sac" in French is masculine. So, it uses masculine definite article "le" and indefinite article "un".
A schoolbag is "un cartable" in French; cartable is a masculine noun.
un sac
Sac is masculine (Larousse, 2005, p. 928)Reference:(2005). Larousse French-English English-French Dictionary. Paris, France: Larouuse,
A handbag is "un sac", which is masculine. I'm not sure what you mean by asking how to express it in the feminine.
"Sac" is a masculine noun in French.
a handbag is 'un sac à main' in French. This is a masculine expression.
Either. It stays the same for both masculine and feminine words. The only time you add an agreement is if the word is plural. Here you add just an "s", whether the word is masculine plural, or feminine plural. E.g. la table rouge - the red table le sac rouge - the red bag les livres rouges (masculine plural) - the red books les fleurs rouges (feminine plural) - the red flowers Apologies for the lame examples. I picked the first things I could see in my living room...