I don't
need to vorlouf with my bag system. I've done it before when I used a standard grain bag that wasn't fine enough to catch all the particles. But with a paint strainer, the bag is fine enough to completely catch all husk material and crap that might get into your kettle.
Sometimes, I'll drain from my unmodified cooler mashtun using the spigot on the thing. If so, you'll basically set up a grain bed inside the bag without having to do anything yourself. However, I am unconvinced that this does anything better than just lifting the bag & grain out and dumping that liquid into kettle.
Remember, the only reason any ever vorloufed back in the day was because that was the only way to strain off the wort from the spent grain. They didn't have flexible heat-resistant bag with elastic tops like we do now. Also, big commercial operations can't get bags big enough for this work, so they use manifolds and such out of necessity.
ADDED BONUS: absolutely NO chance of a stuck sparge. None. Not gonna happen. Ever. Even with 60 oz of canned pumpkin in the mash. Seen it wit me own two eyes.
Caveats:
(1) The Tea Bagging method will work only for so much grain. If you start getting above 13lbs or so, the bag prob won't hold. (work around: throw 1-2 lbs of extract in to get up to that IIPA or RIS gravity)
(2) I haven't seen paint strainers larger than 5 gal, so you need to stick with a 5 gal mash tun. Given 80-90 efficiency seen w/ this setup, its not as bad as some might think. The Australian dudes use custom-made chiffon (I think) bags that can be sewn as large as needed though, but you have to get it custom made.
(3) This option is NOT for anyone who's already got a "traditional" mash tun set up. We're not trying to convert you, we're just trying to get extract and partial-mashers to realize that you can go all-grain a lot simpler than they've been told in the past. However, if you're sick of stuck sparges and your spouse is tired of 3-tier brewing sculptures taking up your garage, then you might want to look into this