Nouns ending in -is are usually masculine.
Is tapis masculine or feminine?
letapis
The rule behind it
94.1% of -is nouns are masculine
In context
C'est super de dormir sur un tapis.
Sleeping on a carpet is great.
Les rideaux et les tapis ont été changés.
Curtains and carpets were renewed.
J'ai renversé mon café sur le tapis.
I spilled my coffee on the carpet.