During the American War of Independence and later during World War I, soldiers were advised to wear their rucksacks on their backs while sleeping to keep them on their side and avoid sleeping on their backs.
Mrs. Weasley was still glowering as she kissed Mr. Weasley on the cheek, though not nearly as much as the twins, who had each hoisted their rucksacks onto their backs and walked out without a word to her.
Irfan Naseer, Irfan Khalid and Ashik Ali, all from Birmingham in central England, intended to explode eight rucksack bombs in crowded areas across the country.