Great for walks, the dog park, really for anytime/anywhere. Just clip it to the leash and go.

Pros: portable, simple to use

Cons: none

they are small and can be kept in a pocket or one always in the car. Easy to use and dispose of. A must when having your pet anywhere in public.

Pros: easy to use

Cons: having to use it

Great, especially when traveling--bags can always be at your fingertips. Nice option to have the dog carry the bags in case you forget!

Pros: Convenient and ready to use

Cons: None

This is great to have when you're walking your dog!

Pros: everything

Cons: nothing