I've used this bait bag and it fell apart on me very quickly. The belt-hook snapped off and the aperture device also failed within a few months.
While this might work well for casual trainers, those of us who need to access treats many times each day would be better off with a more durable treat bag.

Pros: Easy access

Cons: Not sturdy, small capacity

very handy for dog class especially if the whole family is involved. We could fill the bag and just pass it around to whichever person was working with the dog rather than fill everyone's pockets with treats.

Pros: Keep treats handy

Cons: none

This bait bag is ok because it will attach to your belt but the treats will fall out if you bend over.

Pros: Hooks on your belt

Cons: small opening and pouch

Really like these - they are just so handy to grab when on a walk and while training your dog.

Pros: Keeps the crud out of your pocket

Cons: none

Great way to easily get at treats while training.

Pros: good place to put treats

Cons: treats can spill