in the bag Definition

bag¹
noun

1. A container made of a soft material with an opening at the top, for carrying things.

Thesaurus: purse, pocketbook, pouch, sack, satchel, knapsack, rucksack, saddlebag, suitcase, briefcase, valise, haversack.
2. A bagful.
3. An amount of fish or game caught.
4. colloq
A large amount of something.
Form: bags
Form: bags of something (especially)
5. offensive, colloq
A woman, especially an unpleasant or ugly one.
6. Loose wide-legged trousers.

Form: bags
7. slang
A quantity of drugs, especially heroin, in a paper or other container.

Idiom: bag and baggage

Completely.
Example: clear out bag and baggage

Idiom: in the bag

colloq
As good as secured or done.
Thesaurus: certain, absolute, sure, definite, sewed up.

Etymology: 13c.