The Steamcrave Ragnar
SKU 9728487 takes 18ml and up to 25ml with all the bits in the box
but it's a bit pricey here
it is on the large and weighty side, (just the tank) might be worth lookin around a few sites
for a bargain, if you are interested there are some out there
Also the V2+
SKU 9729793 is worth considerin, 8ml/16ml no as cumbersome as the Ragnar, great vape, easy fill
I wish you well with yir hospitalisation ;)