Interesting topic!
There are a ton of options here. Creating a kit for photos/video/audio is a huge arena.
Creating a compact dry camera kit for say sea kayaking adventures is a specific challenge. Very doable if you have a specific goal in mind plus how important the end project is to you.
Couple of pointers:
If you hope to create a killer video with sound of a fun weekend adventure don‘t even try to capture long video camera sessions with perfect video and sound. Long camera shots are boring! Instead put your effort into capturing brief moments that can be edited into a sequence.
Try to capture the same brief scene from different camera positions. Move your camera from the front of your boat to the back of your boat and over to your paddling partner. Experiment. You can repeat a specific scene to achieve this. You can then mix these shots into a sequence. Wany more interesting!
Mix up the viewpoint: Hollywood movies have quick moving changes from wide shots, medium shots and closeups. Try to mix it up and your sequence will be way better.
Bad sound is way more annoying than bad video. Big time. About the only sound that is captured in feature films is dialogue. The rest is created in Foley Sound studios. It is easier to record bits of audio separately and use them by adding them to your video segments. The Zoom H1 recorder is a killer compact microphone package for less than $100. Putting it into a condom will keep it dry and still capture way better audio than most cameras.
You can build your own audio library of sounds: waves, birds, paddling, dragging a kayak on the shore, camp fire, distant voices, even quiet “silence”, etc, etc. No one will ever know your audio was not captured “in camera“. Audio from a handheld action camera is usually horrible.
Learn to capture B Roll: little bits of video and audio that you can mix in with your main footage. Landing, exiting your kayak, setting up camp, tying knots, hatch covers, lighting fires, cooking, anything.
You don’t have to record everything. Enjoy the outing without feeling pressure of creating a cinematic masterpiece. But capturing short planned shots can be way easier and way more interesting than one ten minute video with the camera running constantly…