Every angler has that moment — the session where you forgot one item and it completely ruined (or nearly ruined) the trip.
For me, it was spare head-torch batteries on an overnight. One flat battery at 2am, a screaming run, and absolute chaos 
So let’s hear it:
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What did you forget?
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What happened because of it?
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And what’s now permanently on your checklist?
Could save someone else a very painful lesson.