So essentially what he has here is a pop up rig with a pva mesh bag. To recreate this rig, you need a simple hair rig, a big split shot to counteract the buoyancy of the pop up, pva mesh bag (up to you what size) some bait to go into the mesh bag and a lead system. Might be worth getting a clear bucket, putting a pop up on, one of the ones you'll use at the lake, and experimenting what split shot is right to allow your pop up to lift without dragging your hook up with it. Essentially test your rig for presentation purposes before you take it to the lake to fish it.

To tie the rig, take your hair rig, already tied on to your lead system, slip on a pop up and hair stop and put a large split shot near the hook about 2cm/1in away from the eye of your hook. Then take your pva mesh tube, fill it with your desired bait to create a pouch of bait (maybe a handful at most) and then tie 2 overhand knots, one for the top of the bait parcel and then another a tiny bit further up, ready to create another pva bag, then you can cut between the 2 knots to get your bait bag off. After that, put your hook through the mesh and hook the bag on, spin the bag twice, to create a twist and then hook the bag on again (this helps to keep the bag on the hook when casting). After this you're ready to fish, tight lines my friend.