The difference is, the eggwhites from eggwhites international will last up to 90 days...are drinkable, are double filtered and have the consistancy of milk...easy to drink.
The one's you buy in the store have a shelf life of 7-9 days...
It's about $2.00/ dozen for a much cleaner protein...it's the difference between a chop sirloin and a fliet mignon.