There are two basic models, the One Hand models, with a small flat handle, that you can hold and operate with one hand. The standard or regular handle models are with longer handles, and require two hands to operate.
There are models that permit a single change, and repeat models, that permit two changes. Models with zippers enable you to open them at the bottom, and pass your hands through them, to prove them empty.
All the bags come with detailed instructions, and ideas for dozens of applications.
Outer diameter 16 cm, inner diameter 10.5 cm, length 30.7 cm.