An overnight bag without the expedition
Give a short fishing stay a proportionate packing list.

Separate essentials from possibilities
Pack around the actual accommodation, weather, method, and length of stay. Distinguish what you will use from what merely feels reassuring to carry. Confirm arrival arrangements and storage before adding equipment that may have nowhere useful to go.
Keep wet gear contained
Allow a practical place for damp clothing and used tackle without sealing it away indefinitely. Follow equipment care and local biosecurity guidance when returning home. The bag should support the trip in both directions, including the less glamorous journey back.
Leave time for the reset
A short stay still creates laundry, drying, and repacking. Include that work in the plan rather than borrowing it from the following morning. A manageable return makes the idea of another overnight visit much easier to enjoy.