What to bring on a day hike

I am going to list out things I usually bring to a day hike at our meetup (Non-winter days).
I am not a professional hike guide but hope this helps.
I put links for some items for your reference and the Amazon affiliate program.

🎒Gear

Hiking Shoes

Hiking shoes are important gear to protect you from injury or getting wet from the rain.
I use low-cut shoes but Mid cut is recommended. It protects you from twisting your ankles or sands getting in your shoes.

Rain/wind-proof wear

Mountain weather can change anytime, even if the weather forecast is good, I usually bring at least a Goatex material softshell jacket just in case.

Trekking poles

I am not used to using poles but it's supposed to be good for your joints as it allocates the leg joints stress to the arms as well?  I bring sometimes just in case https://amzn.to/3tb5MDD

⛑️Risk avert goods

Phone charge battery

In case someone gets lost, Better to make sure you have enough phone charge to call for help to 110 (police number)
I carry 15,000mah or 20,000mah one which can full charge phone 2 twice.
*If you call 110 from your cellphone, the police can backtrack where you are.

Medical first aid kit

・Wilde band-aid 
・Medicine: i.e. Pain killer, Stomach pain killer, leg cramps medicine, or any medicine you take
(I've had 3 people having leg cramps problems during my meetup.  I think it's a more common problem than people think. I recommend carrying medicine.)
・Wide cloth to tie. For in case someone breaks their bones
・Insects poison remover   https://amzn.to/3taxMaK
・Scissors
・Small belt (For tourniquet)
・Lighter
・Hokkairo 

Navigation tool - MAP&GPS

In case you get lost, it's better to have a navigation tool of your own.  You can download a mountain map on YAMAP for free and track the route on a smartphone or watch by GPS.  https://yamap.com/

Headlamp

Mountain after sunset is very dark. it's good to have a headlamp just in case. This way you can still use your two hands while putting out light.   https://amzn.to/3u0m7KQ

Whistle

 A whistle will help you notify people where you are.   This is helpful for other emergencies like earthquakes or any dangerous situation as well so I always carry one with me.  https://amzn.to/3tVO7z3

Bear repel goods

I don't think this is necessary if it's a popular mountain but if I see a bear encounter report, I bring these items for the group.
Bear bell  https://amzn.to/3tdjVjZ 
Bear repel spray  https\://amzn.to/3u2laBJ

🌲Others

Food, drinks

I usually grab Onigiris and water from the nearest Conbini.  My favorites are Salmon or Ebimayo or Tsunamayo :)

Sun protection