Bag for English anti-gas mask Small Box Respirator. SBR bag in beige canvas, with its carrying strap, functional press studs, cord present. Stamp in black ink with date 1917, Broad Arrow. Stains, tears, wear from use. Small Box Respirator Gas Mask BagKhaki canvas SBR haversack with shoulder strap, functional press studs, and cord. Black-ink stamp with 1917 date and Broad Arrow. Stains, snags, and service wear.