Alternative Fuel Tanks

I'm guessing most on here have the magic expanding tanks, has anyone found a decent solution? So far I've found:

Beater Japan - Aluminium and super pricey
ETI Fuel Cell - Kevlar composite, half the price of beater and I think lifetime guarantee (https://eti-fuelcel.com/product/monster-sr2/)

[Darkness]

Originally Posted by rac3r

I'm guessing most on here have the magic expanding tanks, has anyone found a decent solution? So far I've found:

Beater Japan - Aluminium and super pricey
ETI Fuel Cell - Kevlar composite, half the price of beater and I think lifetime guarantee (https://eti-fuelcel.com/product/monster-sr2/)

Or find a good steel one. Easier if you’ve got a pre2002 bike with the vertical battery.

A bit like the one where I was asking “what is this off?”