Lulu, I don't know as it really matters but we tend to group things by where and what we'll be needing them for. For instance, I have one little bag (plastic or other cheap bag) for laundry powder, pins and sink stopper.
Things we may need while sightseeing are split between our the day bags: pin the safety pins to the inside lining, baggie of bandaids (me) wet wipes (both) kleenex (both) Advil (me) glasses wipes (husband), pens (both), etc.
The Husband and I also split up the plug adaptors (we take as many as 4): one in each suitcase, and one in each day bag. I've been known to run a quick battery recharge at available outlets in cafes during a break (I take a lot of photos, and have run down even my backup battery in a day!).
Toiletries go into zip toiletry bags: inexpensive ones from Target or similar that we've traveled with for years. We each have our own, and share some items to keep the weight down. They don't have hangers. I don't travel with makeup, and we don't take insect repellent or other stuff that we figure we can buy there if we need it. Besides Advil, the only OTC meds we bring along are Imodium and a little tube of Neosporin.
Obviously if you're not checking a bag, all gels, liquids, creams and pastes - none of them larger than 3.4 ounces - must be in a separate, 1-quart, clear baggie for security screening. Anything larger than that must be in a checked bag. We do check our bags so we haven't had to sort this stuff separately.