Of course you are supposed to keep and collect those useless containers (plus lid) since you "surely will be able to use them for something" in the future. For

Of course you are supposed to keep and collect those useless containers (plus lid) since you "surely will be able to use them for something" in the future. For storing screws, rubberbands and Kulis that nobody has or keeps anymore... A roll of Gelbe Säcke might fit inside.