The lupi harness is for walking, it['s far too thin to attach a longline to, also because the lupi brings the front feet up, it would do damage on the impact of reaching the end of the longline.
I use a 3 peaks one which I bought at PAH, very light + easy to clip on, + straps wide enough not to do any damage. And it's reflective

You can see it on Boris in the little vids I posted on sunday
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Tracey
Proudly owned by:
Zetstaff Blue Demon (Boris)
Crimsonstaffs Dream Girl (Tilly)
Tugga the Bugga (Tuggs)
Dympner Great Chart (Buster) - RIP big boy xxx