Thanks for the tips. Are you saying a 7.9g bucket is too small?
More food for thought.
Last fall I added the pomace from 8 lugs (288 lbs) Grenache to a Tavola Merlot, and recently bottled it. Fermentation was in a 32 gallon Brute, so space was not a problem. The initial post-fermentation volume was 9 US gallons (lightly pressed grapes have a lot of wine still in the pomace), which reduced to just over 8 finished gallons (bulk aged in 23 liter carboy and two 4 liter jugs).
When bottling from more than one secondary container, I homogenize the wines into a single container, then add K-meta and glycerin. This makes all bottles consistent.
I had it in my head that it would all fit in a 7.9 gallon primary. I leave a bit in the bottom of each container to avoid picking up sediment. This extra wine gets bottled afterward, and if it's a bit muddy, I ok with drinking it. I figured I'd have a few bottles less than 8 gallons.
Well ... it fit. With absolutely no room to spare. In hindsight, this was far from my finest or brightest moment in winemaking, although it did work.
This also illustrates the saying, "you're never too old to do something stupid."
I didn't want to use a 32 gallon Brute for 8 gallons of wine, and don't currently have anything in between. At least one 10 gallon Brute is on my shopping list ...
If you're making 23 liter kits, a 7.9 gallon fermenter should normally be fine. However, it is useful to have a larger container for those other moments.