charcoal sack; straw bag for charcoal
A traditional straw sack specifically used for storing or transporting charcoal. The word is straightforward and has no special register or usage restrictions.
In the old days, they packed charcoal into straw sacks and carried them.
Compound of 炭 (sumi, 'charcoal') and 俵 (tawara, 'straw bag'). The reading すみだわら reflects rendaku voicing of たわら to だわら.