In most countries on the continent you are not allowed to fill your bottle (of whatever size or make) with LPG yourself at a regular gas station. Be careful if you consider to go that way! You can only get it filled at separate specialised gas dealers, and they are more difficult to find than Camping Gaz resellers...
We agree with most here that the 907 bottle is quite adequate for holiday use. We always have one spare with us, that doubles as gas source for our Cadac Safari Chef.
Having said that, sometimes you do not want Camping Gaz, since it is butane and butane doesn't evaporate below 4 degrees Celsius. So, when you are out in the cold in winter, you may have difficulties. Than you could do with a separate tank that you can have filled with propane. For such occasions there is this refillable aluminum gas bottle, the only one we have ever found that is available with the exact same dimensions as a Camping Gaz 907, and uses the same regulator:
It comes from
Ekopool in Slovenia, and can be post ordered from Germany.