EA81 coolant bottle

[Elkonastick 10]

Hi all. I have a MkIV with the soob EA81. I had the flow valve shut too far and temp got up around 200, not bad I know but it did cause it to spit coolant out then suck bottle dry when I opened valve more. The coolant overflow/expansion bottle is a 16oz plastic what looks like a hospital issued water bottle. (Can't get pic to upload) I've seen others use plastic bottles also. It just seems, well, cheap. I've found aluminum coolant bottles on line designed for just that purpose. The system looks like a closed non-vented type. There's no vent line to atmosphere I can see. Have any of you tried the purpose built aluminum ones? Any recommendations? Thanks everyone!

[culater 12]

I used one of these with my Soob https://www.ebay.com/itm/2015-Kawasaki-Ninja-300-Ex300b-Abs-Oem-Coolant-Water-Tank-Reservoir-Bottle-125-/323312090364?hash=item4b46e6fcfc

[ChrisBolkan 130]

https://www.usplastic.com/catalog/item.aspx?itemid=24889&catid=934

This is what I use. Very high quality. Available in many form factors. not expensive.