What size bag do I need to take kit on a plane

[caving_fox]

Helping with weight are https://www.lbcboots.com/full-length-boots/ which I've just tried. They really are very light!

 

[moletta]

Which airline are you flying with? You might get some stories!
Check you actually can have a cabin bag as well as luggage (cabin or hold) also weights allowed.