Middy River Side Lead Feeders (Code R324-5).
Middy river incorporate a patented flick top cap.
It is designed to hold upto 18lb of pressure when pulled centrally.
Flip off the cap using the thumb clip. The thumb clip also helps stop the feeder rollong on fast swims.
After you have flipped the cap off, the container part of the feeder is completely free from your rig.
You can now fill by scooping the bait without damaging your line or hook length, and for speed fishing have ready filled feeders at the ready.