With current EU rules hot water bag can only withstand 80 celsius max without wearing , but with electric kettle you are most likely to set it to 100 ( and sometimes there are no ways to do otherwise ) . Going above 80 lead to leakage . This design is very leakage-proof , there is a valve on the cap for over pressure , anti reflow walls inside , the opening is big and since the whole thing stand still on a table , you should have 0 issues to fill it .Exellent design , solid build with good material, Comes with a replacement o-ring and manual is clear and easy to understand even for non english/japanese reader .
Order tooks 9 days to be delivered to France, no customs , clear price , packaging exemplar , tight and solid + a nice little gift inside ;-) .