I have cycled the Camino Portuguese and Via De La Plata.
This is my recommendation what to pack but each person is different.
2 Pairs of cycling pants and tops
2 Casual T-shirts (preferable dark that doesn’t crease too much)
2 Sports bra’s
2 Underwear
2 Pairs of socks, I like to pack a very thin/small pair that dries quickly and a thick pair of trail running socks
1 Pair of trainers which I also cycle in
1 Pair of slops to walk around in and is sometimes needed to shower in.
1 Pair of jeans
1 Pair of shorts
A visor or cap
Sun glasses
Sun block
Cream blusher which I wear as lipstick or eye shadow if necessary
Vaseline
UV sleeves
Cycling rain coat
Fleece to cycle in if necessary and nice enough for casual wear
Buff
Pair of cycle gloves
Brush
Toothbrush and small toothpaste
Shampoo (which might be used for soap and washing powder)
Conditioner
Small quick drying towel
Medical aid – headache tablets, plasters, Antihistamine, Imodium, Buscopan, Allergex, vitamins
Natural sleeping tablets, eye patch, ear plugs
Swiss Army Knive
Silk sleep sheet
Back cycle light
Gel saddle cover if you are not very saddle fit
Pen and little book
Smart phone with Translate and Maps.Me
Small string back pack
If you are doing long distances then an option is to take another water bottle
Two washing pegs, 2 cable ties, piece of string
Air phones
Zip lock bags
Double fast charging plug for smart phone and tablet