I have been thinking about situations where I use a Spectra sling at an anchor and have people clip into it as a safety while waiting to get on rappel. A Spectra sling by itself is probably not a good idea. It is very strong but very static. They can break when used in the wrong fashion. Ice climbers use energy absorbing devices such as a Yates Screamer. I thought of tying my own small load limiter. For canyoneering this could be a small, compact, cheap device. I would clip it into the anchor first, then add a Spectra sling for all to use. Paul Stovall and I did some backyard drop testing. We approached a fall factor 1.7 to 2 with 0.667 kN weight. We tied one of our old search and rescue 8 mm nylon prusiks as a Purcell prusik (3 on 2 configuration) load limiter. These are the typical prusik loops used in technical rope rescue. They are used in tandem to catch large loads, usually at a fall factor of 1/3. We clipped it in line with a Mammut Contact 8 mm Spectra sling. First, we dropped with the Purcell/Contact combo. The second drop was with just the Contact sling. Our hypothesis was the Purcell would be a load limiter protecting the Contact. We thought the Contact might break without the Purcell. For the combo: the peak force at the anchor was 7.7 kN. The Purcell slipped until it hit the double overhand bend that forms the prusik loop. Nothing broke. The Contact sling was intact. The prusik suffered a bit of heat. It was fused into one knot! For the Contact sling by itself, the peak force seen by the anchor was 9.5 kN. It did not break. However, it suffered tiny damage to the material where it looped over the carabiner. In the attached photo small portions of material are seen sticking out. However, the weight bounced. Once the system came to rest, it was cross loading the gate by the Contact sling We decided the small Purcell prusik might not offer more than psychological protection to a person clipped in. The peak forces in the event of a fall with either configuration might be too high. A person could suffer harm or the anchor could be ripped out. Plus, a much longer Purcell prusik would be needed to avoid the prusik hitting the knot. At some point it becomes a cumbersome tool to carry on a harness for the rare times it would be used. Cross loading the carabiner gate is a potential disaster. They typically break at 7 kN. The forces in our tests were greater than that.