It stands for dependability. It's against normal use. It's against abnormal use. Photographers have abused their Tenba bags for years and they have still held up. And you are out of luck, and recourse.
Nothing lasts forever.
You can deliberately destroy a Tenba bag. So if it's in a fire, or dropped into a vat of acid, or rammed with a forklift, or cut with a knife, those are the type of things that are beyond the call of duty and we will charge you for the repair. Tenba customers are a tough bunch to please. This guarantee tells them we stand behind what we sell. Tenba budget paks are covered by a two-year guarantee against everything but deliberate destruction.