

That's where the Bog in a Bag comes in. Similar to other backpacking stools, Bog in a Bag uses folding legs to pack down into compact, portable form – 25.5 inches long x 5 inches in diameter (65 x 13 cm). Unlike a regular backpacking stool, Bog in a Bag has a hole from which you hang your potty bag. Then, you sit down and treat it like any toilet. The compatible plastic bag has absorbent crystals that turn even the sloppiest mess into a neat, carry-out package.
More at Gizmag. Oh it weighs 1.2 kg so not a lightweight by any means.
Andrew