I had seen these in Costco before and in some convenience stores, but finally took a picture last visit to Costco.
This is soju...in juice boxes! As a reminder to what soju is. Soju is a very distilled rice wine, very popular in Korea and very high alcohol content. It is probably the most drunk alcohol here and can be found in a wide range of cost from $1 - hundreds of dollars/ per bottle. I haven't had the most expensive, but it usually tastes like a very distilled vodka. It is clear in color and you drink it out of Korean style shot glasses.
For Koreans...it is usually "bottoms up", but for me I sip.