The word 'haversack' is correct and can be used in written English.
A haversack is a type of bag or backpack that is worn over one shoulder and used to carry small items on short trips or hikes. Example: The hikers packed their haversacks with snacks, water, and first aid supplies before starting their trek up the mountain.
In my haversack all this time I had been carrying a treasure which I now produced – a box of 100 Abdulla Egyptians.
Now he casts a shadow like the tree trunks, because it is day, but he cannot find his way out of the wood and stumbles around in a circle without knowing it, takes some crumbs out of his haversack, unscrews the top of his canteen, and drinks, sending the helmet back over his neck.
He'd arrive on his bike, his haversack full of groceries, and he'd spend the afternoon with us.
The oddest thing was that she wasn't worrying, although she knew she ought to be; especially when they made plans to keep the shopkeeper talking while she, Jane, slipped bottles of whatever alcohol she could get into their canvas haversack.
"Isn't she good?" Paddy said when they'd driven on and he'd excavated in the haversack, finding dusty Mateus rosé and Johnnie Walker and several bottles of barley wine.
All he has left in his haversack is a few crumbs of zwieback from his last ration.
There was a stirring in the crowd waiting to embark, luggage gathered up, haversacks swung into place.
They'd all have bags on their shoulders, knapsacks or haversacks, army surplus, or old gasmask bags, for their lunches.
In their uniforms and gear -- including tin canteens, cups, haversacks and red-braided artillery hats -- the troops took battle poses that could have come from the Civil War photographs of Mathew Brady.
When I see a player haversacking or quaffle-pocking, or even a coach throwing a sharpened broomstick at an old witch, I see red".
The mess tin we each have buckled onto our haversacks is just the right size.
