Green’s Dictionary of Slang

(US tramp) a hobo’s bedding.

1913		B.T. Harvey ‘Word-List From The Northwest’ in DN IV:i 26: crumb, n. A hobo’s pack of blankets.
1950		Goldin et al. DAUL 53/2: Crum or Crumb. [...] a hobo’s roll of bedding and belongings. [...] Crummy, n. 1. A hobo’s roll of bedding, utensils, etc.
1960, 1975		(ref. to 1910) Wentworth & Flexner DAS.