sponge bag

a small, usually waterproof, case for carrying toilet articles.

Origin of sponge bag

First recorded in 1855–60

Pamela aimed a sponge-bag at him, which he dodged, and Elizabeth Bremerton sat down.

Elizabeth's Campaign |Mrs. Humphrey Ward
The sponge-bag trousers are unrolled, the elastic-sided boots untreed, the made-up tie dusted.

Berry And Co. |Dornford Yates
Philip left his walking-stick, his socks, and the Baedeker at Bologna; she only left her sponge-bag.

Where Angels Fear to Tread |E. M. Forster
Hennie Penny persisted in wearing an unbecoming cap like a sponge-bag, which subjected her to comment.

Pearl of Pearl Island |John Oxenham

"See here," he said seriously, laying his hand with a warning gesture on my arm, the ivory knob popping out of the sponge-bag.

The Other Fellow |F. Hopkinson Smith

sponge bag

a small bag made of plastic, etc, that holds toilet articles, used esp when travelling