haversack
US /ˈhæv.ɚ.sæk/
UK /ˈhæv.ɚ.sæk/

1.
mochila, morral
a bag carried on one's back or over the shoulder, used especially by soldiers or hikers
:
•
He packed his lunch and water bottle into his haversack before heading out for the hike.
Guardó su almuerzo y botella de agua en su mochila antes de salir a caminar.
•
The soldier carried his essential gear in a sturdy canvas haversack.
El soldado llevaba su equipo esencial en una resistente mochila de lona.