Can anyone recommend a decent rear light that clips on a camelbak or rucksack? I can only seem to find lights that clip onto a seatpost.

Moon Nebula comes with a clip. Bloody bright too. I run it on it’s lowest setting and battery lasts loooong time.

Cateye wearable x

Moon pulsar if you don’t mind battery

My fibre flare is on at least its fifth winter.

https://www.ebay.co.uk/i/401645498391?chn=ps

See.sense ace does. It’s really small and links to Garmin.

£30 with BC discount

I’ve got a Topeak Alien for that purpose. Batteries only, but they last a good long time on flash.

Moon Pulsar – cheap, AAA batteries that last ages, lightweight & a really strong tight clip that will stay secured on those little tags on bags/jackets.

Niterider Cherrybomb. Mine must be 8 years old now.

If you go to your local quid shop, for a quid will have a rear light with a clip, buy 2 or 3, bit of gorilla tape over the end to stop it sliding off. When the batteries are new they will be sufficiently bright enough..

Lezyne Zecto has a clip but I use the rubber strap and it’s very secure. Has an internal battery but seems to be going strong after 3 years and has a charge indicator that’s useful. It has a few modes but I just leave it on the daytime flash setting.

A Moon comet, and some of the Lidl copies have served me well

I use these as my commuter lights – https://www.ebay.co.uk/itm/223215003478

Clip or rubber strap, USB rechargeable, £5 each or £9 for a pair.