@chrissol, make sure you also allow room for krausen growth. Could be an additional maybe 1-2 litres on top of your 5 litres of wort?
FYI, if still choosing the kit, would strongly recommend Festival New Zealand Pilsner which worked really well for me. Believe this kit uses MJ's warmer fermenting 'lager' yeast. So, for a lager brew, it's an uncharacteristically clean and quick fermentation with no need for 'cool temp' lagering nor prolonged conditioning.
And, kit extract comes supplied in two identical pouches, so easy to split. Though only one sachet of yeast. (Split sachet perhaps, and keep leftover in the fridge? Or you could supplement with an additional sachet of MJ branded original).
Think yeast supplied is Mangrove Jack's Craft Series Yeast - Californian Lager M54?
https://mangrovejacks.com/products/californian-lager-m54-yeast-10g