A Note. Not a small car, looked up that Puma, not sure if Im looking at the right models but the car doesnt look substantiall different in size
We put the back seats down and the entire back is our suitcases, various ruck sacks, the cool bag of bits and bobs (we're always self catering), a box of car emergency items like wipes, screen stuff, spare bulbs, blanket, other car bits that I cant remember, oil and whatnot. If its summer we have our wetsuits/dry robes. If its winter we have various bags and boxes with boots and coats in. We may or may not take our folding beach chairs and windbreak but even if we dont there wouldnt be room for a person to sit in it, let alone any bags.
If we take our bikes then there are our panniers which are quite large, and bike equipment, waterproofs, bike covers, locks and chains etc. Theres always a big shopping bag of snacks and nibbles.
OH has a whole bag, like a laundry bag sized bag of boots and shoes. We both have a rucksack each of medication. Plus his laptop and a massive bag of electricals/chargers etc.
And most threads on here I often read that people take spare kitchen equipment when they travel, I hear of people taking frozen meals, or air fryers!! Irons and spare baking trays and foil and stuff.