Green’s Dictionary of Slang

snag n.4

[dial. snag, a morsel, a snack, i.e. where the tramp keeps such sustenance]

(N.Z.) a tramp’s backpack.

[UK]Boy’s Own Paper 11 Mar. 376: After watching them shoulder their snags, and, in obedience to my directions, slouch to the snaggers’ whare, I closed the door.