I have 10 ultralight ditty system...I know when I put my 10 bags in I've got everything because I know I put everything away immediately after use in the correct bag. They are all different sizes depending on need:
(1) largest bag/clothing ( two sleeveless tops, one long sleeve sun shirt, two bottoms, rip skirt, merino 1/4 zip),
( 5) smaller bags for 1) sleep items ( pillow case, silk liner, earplugs, toothbrush/paste tabs,micro flashlight ), 2) undies/bras/socks/bandanas, 3) shower bag ( solid shampoo/conditioner /and soap, hairbrush, deodorant, travel towel, small linen muslin facecloth, S hook ) 4) laundry bag ( line, clothespins, tiny sewing kit, laundry bar chunk, tiny packets Tide, diaper pins ) 5) misc bag( one shoelace, extra pole tips, a few tea bags, a few salt packets, COVID masks, baggies, spork, titanium cup) ,
(4) really small ditty bags for 1) electronic plugs, cords, adapter 2) footcare kit :compeed glide sticks, bandages, needle/thread/gauze, alcohol wipes, bacitracin, anti fungal packet, KT Tape, thin white peds, nail clipper, leukotape 3) medications/inhalers 4) face care, sunscreen stick, lip balm, moisturizer, tweezer, sample mascara
I have a bottom zipper on my pack for rainfly and rain poncho, travel down blanket and windbreaker goes loosely on bottom of pack, clothing bag in middle with two smaller bags on each side, one smaller bag and the 4 really small ones on top ...all in main bag.
The very top of the pack in sep compartment is reserved for guidebook , sunglasses and food.
Birkenstocks in front of pack, poles to sides...total pack weighing in at 13 lbs ( without food/water )
I do have a small fanny pack in front for passport, credential, phone, glasses, tissue, wallet.
It's worked so far...Camino #8 in two weeks!