Hello
Looking for a compact battery bank to carry with me on a. 3 day cycle tour. Needs to be able to charge iPhone garmin and bike lights which are all micro USB.
So many to choose from. Any recommendations welcome.

Thankyou

Anker. Pick the best balance between power and weight. I’ve got 15600 mah which would be about right for you, gets me 3/4 iPhone charges and a couple of iPads and garmins.

Not that light though.

+1 for Anker. (mine’s an E5)

discussion here

RavPower 10400mA from Amazon – worked perfectly for a 5-day event in the arctic at -20C and below

I got an Anker 21000 one which I am very pleased with.

Those are great and should cope ok charging the phone and garmin.
What type of lights do you use? If the lights have a battery larger than the power bank then re- charging the battery for the lights will drain the power pack to empty.
I would try spare battery for lights and keep the powe bank for gizmos. Also keep the phone on flight mode to save power. ( or switch it off) .