I always put my hookbait in the bag first, then use a mix of our bag pellet and groundbait, then fill approx 1/3rd up our 60 x 105 solid bags.
Then fill the rest of the way until just covering the lead. I tap the bag to compact it, twist PVA bag then tie off the top with PVA string.
All that is left to do then is push in the corners, lick and stick to make it aerodynamic and also having the lead dead centre aids casting accuracy 👍👍.