The short answer for a Cornish Rex
Pack warmth first, then food, then entertainment. A Cornish Rex wears only the soft, wavy undercoat of a normal cat's three-coat system, runs a fast metabolism, and bonds intensely to people. A week with a sitter goes well when the bag contains his own blankets and warm bed, his usual food in measured portions, and enough interactive toys to burn the energy he would otherwise spend missing you at full volume.
Warmth he cannot supply himself
A Cornish Rex feels the cold in a way coated cats do not. Pack the blanket he sleeps in at home — unwashed, so it smells of home — a covered or high-sided bed he can burrow into, and a sweater only if he already wears one happily; a sitter's house is not the place to introduce clothing to a cat who has never tolerated it. Tell the sitter where he likes to sleep and to keep his bed away from draughts and exterior doors. If the sitter's home is cooler than yours, a second blanket is worth more than any toy in the bag.
Food measured for a fast metabolism
Cornish Rex cats are lean, muscular and famously keen on meals; a week of guesswork portions shows quickly. Measure his food into daily portions or leave the measuring cup he is fed with, plus written times — this breed will lobby a kind-hearted sitter for extras with real conviction, and the note that he is always 'starving' by design protects his waistline. Send the full week's supply plus a spare day, his usual treats, and clear instructions on the one or two human foods he is never to be given if your household has rules the sitter would not guess. Keep the food identical to home: a Cornish Rex stomach is not the place for a well-meant upgrade mid-week.
Play, company and the sitter's schedule
A Cornish Rex is an active, athletic, clownish cat who expects to be involved in everything. Pack the wand toy he actually plays with, springs or balls he chases, and one puzzle feeder to slow a meal down. Write down his play rhythm — many Cornish Rex cats have a predictable evening burst — so the sitter can meet it rather than be ambushed by it at midnight. Because the breed is so people-oriented, note how much company he is used to: a sitter who works long days should know he will want a proper play and lap session morning and evening, not just filled bowls.
Litter, comforts and information
Send his usual litter — a familiar texture and scent keeps the box reliable in a strange house — and confirm the sitter has a box in a quiet spot, or pack a travel box. Add a scratching option he already uses, and one worn item of your clothing for scent comfort at night. The written pack matters as much as the physical one: feeding times, litter routine, his vet's name and number, your contact details, what counts as an emergency, and his personal quirks — the cupboard he opens, the plant he must not reach, the game that settles him.
Watch-outs during the week
Ask the sitter to flag a Cornish Rex who stops eating, hides from people he normally adores, or feels persistently cold and lethargic — a chilly, off-food Cornish Rex should be warmed, watched closely, and discussed with your vet if he does not bounce back within a day. Loose stools after a food swap are a reason to return to his home food, which is why the bag carries only the familiar. KinsLe's Care Pass is the clean way to hand all of this over: your sitter opens one place for the week and finds the Cornish Rex's feeding times, warmth notes and vet contacts waiting, with access that closes when you come home.