If you think about how to get a gel sack in Subnautica Below Zero, this article has all the answers on the subject.
What is the gel bag in Subnautica Below Zero?
It is an organic structure that is usually found in the walls of caves, and it will be useful in the construction of some crafting materials and in important updates, so it is important to know how to obtain a gel bag.
As mentioned at the beginning, this structure is found on cave walls as amorphous spots with purple bubbles and can be harvested without tools.
However, the actual location has changed quite a few times during the early access of the game. But the official release is believed to place them in the Deep Purple Vents and Lilypad Islands Cave biomes underwater, in regions with deadly wildlife, so you'll have to stay alert and guard up.
That's all you need to know about how to get a gel sack in Subnautica Below Zero and now that you have it, you should be able to get these bags without any problem and use them in everything you need.
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