Last year, I ran out of nightcrawlers and opened a bag of the Gulp 6" nightcrawlers that I had in my boat for a long time unused. We started catching walleye at a faster pace and a lot less junk (which is why we ran out in the first place). I have experimented with this for a few trips after that day and now, I don't even buy worms anymore. Use whole GULP worms on harness and cut in half for casting rigs and erie deries. Try it some time. I doubt you will be disappointed.

P.S.
Don't buy the jars of GULP Alive worms. The cans leak like crazy if tipped. The bags of refular GULP work just as good.