Typically Koreans say 가방 for backpack though

Doesn't 내 mean "my" ,too?

Is 배낭이 usually used for backpacks and 가방 for other bags? I was taught gabang for backpack too

why 있습니다 and not 있어요?

Shouldn't it be 제 가방은 나무 옆에 있습니다. It's my first time hearing 배낭 instead of 가방

Je baekangi namo yeope isssuebnida.