I've tried worm binders. I ended up busting the zippers. I've tried throwing them in the Black Pak, that just becomes a disaster and so does having them in the cockpit with you. I've done the gallon zip lock bag and that worked nice just have 5-6 1 gallon bags (one for each type of plastic) ie. Lizards, turtles, and frogs I combine, ribbon tail worms, stick worms, flukes, trailers, craws, and creatures I combine.
Another thing that works well is a Disc Golf Bag a small one that holds 10-12 discs, it makes a great soft plastic bag, and I take heavy duty rubber bands and separate my plastics, and just throw them in the bag.