Gripsack

As for Bondell's gripsack, it was inconceivable that forty pounds could weigh so much. It pressed him down like a mountain, and he looked back with unbelief to the year before, when he had climbed that same pass with a hundred and fifty pounds on his back. If those loads had weighed a hundred and fifty pounds, then Bondell's grip weighed five hundred.

Source: wiktionary

“Well,” drawled Nares, “there's sixty pounds of niggerhead on the quay, isn't there? and twenty pounds of salts; and I never travel without some pain-killer in my gripsack.”

Source: wiktionary