der Sack
sack
A large bag made of sturdy material such as cloth, jute, or plastic, used for transporting or storing things.
Die Kartoffeln werden in großen Säcken geliefert.
The potatoes are delivered in large sacks.

sack / scrotum
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sack
A large bag made of sturdy material such as cloth, jute, or plastic, used for transporting or storing things.
Die Kartoffeln werden in großen Säcken geliefert.
The potatoes are delivered in large sacks.

In addition to the neutral meaning 'Beutel' (bag), the word 'Sack' (sack) also has several very colloquial to vulgar meanings. Use it very carefully in formal situations to avoid misunderstandings.
Kannst du bitte den Sack mit dem Altpapier in den Keller bringen?
Could you please take the sack with the waste paper down to the basement?
The idiom 'jemandem auf den Sack gehen' (to piss someone off) is very colloquial and means 'jemanden extrem nerven' (to annoy someone extremely). The person who is annoyed is always in the dative.
Seine ständige Besserwisserei geht mir gewaltig auf den Sack.
His constant know-it-all behavior really pisses me off.
The expression 'die Katze im Sack kaufen' (to buy a pig in a poke) is a fixed idiom. It means to acquire something without checking it and thereby take an unpredictable risk.
Informiere dich gut über das Unternehmen, bevor du investierst, damit du nicht die Katze im Sack kaufst.
Get good information about the company before you invest so that you don't buy a pig in a poke.
In the expression 'den Sack zumachen' (to seal the deal), 'zumachen' (to close) is a separable verb. In a main clause, the prefix 'zu' goes at the end of the sentence.
Mit diesem wichtigen Vertrag machte die Firma den Sack für dieses Quartal zu.
With this important contract, the company sealed the deal for this quarter.
In its neutral meaning, 'Sack' (sack) is often combined with materials or contents. Typical compounds are 'Müllsack' (garbage bag), 'Kartoffelsack' (potato sack), or 'Schlafsack' (sleeping bag).
Für die Campingtour brauchen wir noch einen warmen Schlafsack.
We still need a warm sleeping bag for the camping trip.
As a term for a person, e.g. 'alter Sack' (old bastard), the word is strongly derogatory and insulting. It should only be used in very informal contexts and with great caution.
Er ärgerte sich über den Fahrer vor ihm und murmelte: „Fahr doch, du alter Sack!"
He got annoyed at the driver in front of him and muttered, 'Move, you old bastard!'
guy / type
'der Typ' and 'der Sack' can both colloquially refer to a person, usually a man. 'Typ' is much more neutral. It can simply mean 'guy' or describe a person with certain traits. 'Sack' is much rougher and often derogatory. It shows that you find someone unpleasant, old, or unlikeable. Learners should be careful: 'Typ' can be normal in casual speech, while 'Sack' can quickly sound insulting.

Nach dem Streit nannte Paul den unfreundlichen Nachbarn einen alten Sack.
After the argument, Paul called the unfriendly neighbor an old bastard.
Der Typ an der Kasse war freundlich und hat mir geholfen.
The guy at the checkout was friendly and helped me.