So , i took these to Costa Rica on a plant ID course during the rainy season. With out them ,note taking would have been impossible, it rained every day.
Since then I have found them very useful for taking notes in the orchard / nursery.
It either rains on me , or I am dripping sweat on a "normal "note pad, and can not write. Or the note pad that gets left out overnight in the rain.
With these ,You can write on a wet page, and if it gets wet , it will survive.
These are expensive, but worth it for notes in the field .
https://www.amazon.com/Rite-Rain-All-Weather-Side-Spiral-Notebook/dp/B001PD28JM/ref=sr_1_5?gclid=EAIaIQobChMIwsCyoPWk5wIVB6SzCh0fKwG8EAAYAyAAEgKJp_D_BwE&hvadid=153640480719&hvdev=t&hvlocphy=1025197&hvnetw=g&hvpos=1t3&hvqmt=e&hvrand=12433117834946287722&hvtargid=kwd-19653004271&hydadcr=28960_9679462&keywords=rite-in-the-rain&qid=1580167230&sr=8-5
Other brands similar ?
Also other formats of paper , etc. this is just a example.
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I use these at work (I am a mason/bricklayer) and they are very handy to carry in your pocket without worry of losing the notes you have made 
I have used them for years with great results!
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Same here. I have used them out in the rain! Pretty amazing stuff.
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