20 oz., SS , Klean Kanteen, , extended narrow neck, more or less sterilized with well boiled filtered tap water, emptied and refilled again with well boiled tap water. I change the water roughly every 1-2 months.

Para-cord lanyard so I can wrap it over my thumb and the back of my hand and hold it upside down. Useful to fend off aggressive “ critters”. Especially useful for first aid and as emergency drinking water.

Sits in my EDC backpack. Heavy but comforting. I use the single walled model, so I can also use it as an emergency cooking vessel.