What is now commonly known as a Haversack, in the British Army, was referred to as a bread bag. It is generally defined as a small bag with a single shoulder strap. In military use, it was usually made of undyed canvas, or black canvas if you were in a British or Commonwealth rifle regiment, and was used to hold a soldiers food rations. (There will be a lot more about the haversack and it's history, plus all about what was actually carried inside in a future blog post...)
The pattern for this haversack came from, "Soldiers' Accoutrements of the British Army 1750 - 1900" by Pierre Turner. It is the 1880 General Service model. I'm using a 100% cotton canvas in black this time.
(Picture heavy post)