haversack

A small, strong bag carried on the back or the shoulder, usually with only one strap, and originally made of canvas.

And most significant, these hordes of nonmotorized tourists, hungry for a taste of the difficult, the original, the real, do not consist solely of people young and athletic but also of old folks, fat folks, pale-faced office clerks who don’t know a rucksack from a haversack, and even children.

When I went, I left from the station / With a haversack and some trepidation

An oat-sack, or nosebag for a horse.