After a conversation with Lance Shaner, Owner of Omega yeast, the following was added to the FAQ section of their website:
My pack of yeast is swollen. Is the yeast still good to use?
Swelling of the pack is not an indication of a problem with the yeast. It is the result of slow fermentation of residual fermentables during storage. The yeast is still perfectly fine to use (assuming it is within date and has been stored properly).
A traditional Norwegian kveik directly from the Gjernes farmstead, Voss Kveik’s orange-citrus notes present throughout its wide temperature range. So, like the mango-honey profile of Hothead® (OYL-057), Voss Kveik’s orange-citrus is relatively clean across the whole range, and pairs well with citrusy, fruity hops. Ester intensity and fermentation speed take off at higher temperatures in this strain. Non-phenolic and no noticeable fusels, even at higher temperatures.
68–95° F (20–35° C)
We strongly recommend purchasing an ice pack with your liquid yeast to help maintain a reduced temperature during shipment.