This is an article I wrote a long time ago. (It's been edited and updated a few times by Caro Ryan - she deserves much of the credit.)
If you're a male and lead outdoor activities you might find some of this info useful: I'm pretty sure it's not in the outdoor leadership training package, and it's certainly not been a part of any staff handbook I've ever been given!
https://lotsafreshair.com/a-mans-guide-to-periods/
EDIT: Since I wrote this article there have been a number of resources developed that are great for improving field practices in this area. In particular I recommend the work of Peta Lawler from St Michael's Grammar School, St Kilda, Victoria.
If you missed Peta Lawler's excellent presentation about "Periods are Wild" and "Inclusive Period Practices" (and lots more!) at The National Outdoor Education Conference (2024), then Peta has generously shared a range of resources relating to her work and you can find it all here: https://stmichaelsvicedu-my.sharepoint.com/:f:/g/personal/plawler_stmichaels_vic_edu_au/EuGmMyNG8Y5MuEIqPgEXodwBsiZbUP3DtaJk-Oy_HyUmcw?e=sP44c7
It's fantastic resources and advice for what we could and should be doing on our programs to support women (and trans people) in participating in camp/outdoor activities.