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 Thiolized™ version of our popular hazy strain, British Ale V (OYL-011), Cosmic Punch™ Ale generates thiols through biotransformation, releasing tropical aromas experienced in southern hemisphere hops and New Zealand Sauvignon Blanc. This punchy strain unleashes vibrant passionfruit, grapefruit, and guava notes. Expect the same performance and haze you get from British V, but with additional thiol aromas. Experiment with mash hopping or wine grape-derived products to push even more thiols.
*For sale in the US only
We strongly recommend purchasing an ice pack with your liquid yeast to help maintain a reduced temperature during shipment.