Where does “ice bag” come from?

ice bag (English) comes from English ice, from Middle English is, from Old English īs, from Proto-West Germanic īs, from Proto-Germanic īsą, from Proto-Indo-European h₁eyH- — ice, frost.

ice bag (English): A waterproof bag with a wide-mouthed stopper...

Definitions

  1. A waterproof bag with a wide-mouthed stopper...

Ancestry of “ice bag”, step by step

ice bag traces back through two separate lines of ancestry.

via English ice

StepLanguageWordMeaning
1EnglishiceWater in frozen form; Any frozen volatile...
2Middle Englishisice; That which is short-lived like ice; icy...
3Old Englishīsice
4Proto-West Germanicīsice
5Proto-Germanicīsąice
6Proto-Indo-Europeanh₁eyH-ice, frost

via English bag

StepLanguageWordMeaning
1EnglishbagA flexible container made of cloth, paper,...
2Middle EnglishbaggeA fabric container; a bag, sack, pouch, purse, or...
3Old Norsebaggibag, pack, satchel, bundle
4Proto-Indo-Europeanbʰak-—
Every word from Proto-Indo-European h₁eyH- →Every word from Proto-Germanic īsą →Every word from Proto-West Germanic īs →
ice bag — Etymology, Origin & Word History | Etymology Explorer