suitcase
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suitcase
A sturdy, usually rectangular container with a handle, used for transporting clothes and other personal items when traveling.
Ich muss noch meinen Koffer für die Urlaubsreise packen.
I still have to pack my suitcase for the vacation trip.
The meaning of 'Koffer packen' (to pack a suitcase / to pack one's bags) depends on the context. In a travel context, it literally means to fill a suitcase. In an argument or during a breakup, the expression 'seine Koffer packen' (to pack one's bags) means that someone is leaving a place for good.
Ich packe meinen Koffer für den Urlaub.
I'm packing my suitcase for the vacation.
In connection with travel, 'Koffer' (suitcase) is often used with certain verbs: you can pack, unpack, open, close, carry, or check in a suitcase at the airport.
Am Check-in-Schalter müssen Sie Ihren Koffer aufgeben.
At the check-in counter, you need to check in your suitcase.
The idiom 'seine Koffer packen' (to pack one's bags) is a fixed unit. The possessive pronoun (mein, dein, sein, ihr, etc.) is adapted to the person who is leaving.
Er war so wütend, dass er sofort seine Koffer gepackt hat.
He was so angry that he packed his bags immediately.
bag / pocket
'die Tasche' and 'der Koffer' are both containers for transporting things. 'Tasche' is more general and usually more flexible; it can be small or large and fits everyday life, shopping, work, or short trips. 'Koffer' is sturdier, often rectangular, and especially typical for travel when you take clothes and personal items with you. Learners may confuse the words because you carry something with both. When it is about a trip with a lot of luggage, 'Koffer' is more precise. For smaller things in everyday life, you usually say 'Tasche'.
Zum Packen legte Maria den Koffer auf das Bett.
To pack, Maria put the suitcase on the bed.
Für den kurzen Ausflug reicht eine kleine Tasche mit Wasser und einem Pullover.
For the short trip, a small bag with water and a sweater is enough.