I have run a Redbox project in my area. Schools are now, from Jan 2020, receiving funding for Sanpro. How they make it available to kids is up to them, via a Redbox type arrangement or available in the office upon request. Redbox also often includes new pants, tights, wipes, a ziplock bag to put dirty underwear in etc.
Because funding is now available, all the Redbox projects have been closed. But period poverty in general still exists. I'm working with my council to provide (with their funding) sanpro in all council run buildings, leisure centres, libraries etc as well as donate to food banks and women's shelters.
Reusables - i use a moon cup and washable pads. I know full well what it takes to keep them clean and suitable for re use. The issues with childhood poverty (and I speak from my own lived experience) is that many children live in chaotic households. No sanpro is just one of the basics missing.
Access to a washing machine with a regular supply of washing powder, and somewhere to dry pads, is taken for granted by many. But lots of kids don't have this. That's why regularly wearing dirty clothes at school is a sign of neglect and should result in a safeguarding referral.
A moon cup needs to be emptied and cleaned with warm water multiple times a day. Then at the end of a cycle, it should be sterilised. In theory, a bottle of Milton and a cup of cold water is all that's needed. In practice, many children don't have spaces within their 'homes' (hostel, hotel room, sofa in someone else's living room) to store their own personal possessions. So a moon cup would be handy, but storing it and keeping it clean and safe to use is a practical problem that children aren't really equipped to deal with.
Poverty to this level needs to end, period! And this is a feminist issue. Men in prisons have established a human right to shave, and are therefore provided with shaving equipment free of charge. Women in prisons have to pay for their sanpro. No human right to it. So whilst the Redbox project has closed, the many volunteers who ran it will continue to fight for women and girls (and cervix havers if that's what they want me to call them) rights to be treated equally, regardless of biology.