The short answer for a Mongolian gerbil's sitter kit
A Mongolian gerbil staying with a sitter for a week needs his tank or gerbilarium, a deep layer of burrowing bedding, his usual seed-and-pellet mix, a working water bottle, a sand bath dish, plenty of plain cardboard to shred, and written notes covering his bonded companion, safe handling, and what normal gerbil activity looks like. Gerbils are desert burrowers and relentless chewers, so the kit is built around digging depth and things to destroy safely.
Bedding depth is the whole point for a gerbil
Pack far more bedding than looks reasonable, because a Mongolian gerbil's welfare rests on tunnelling, and a shallow sprinkle leaves him exposed and stressed. If his tank travels with him, ask the sitter not to deep-clean it midweek unless something is genuinely soiled — collapsing a gerbil's tunnel system and wiping away the pair's scent marks can unsettle bonded animals and stir up squabbles. Send a supply of his usual bedding for topping up the digging layer, plus toilet-roll tubes and plain corrugated cardboard; gerbils process cardboard into bedding material constantly, and a week's supply disappears fast. Keep plastic accessories out of the bag, since gerbil teeth shred plastic into sharp fragments they should not swallow.
Food, water, and the sand bath
Send the exact seed-and-pellet mix your gerbil eats at home, pre-portioned loosely so the sitter scatters a measured amount daily — scatter feeding doubles as enrichment for a foraging desert animal and stops one gerbil from hogging a bowl. Include a few pumpkin seeds or a small piece of carrot as the treats he already knows. His water bottle should be glass or sturdy with a metal spout, checked daily, because gerbils gnaw bottle nozzles and a chewed-through bottle floods the bedding. The sand bath — a heavy dish of gerbil-safe bathing sand — goes in for coat care; Mongolian gerbils come from an arid habitat and keep their fur in condition by rolling in sand, not water, so note plainly that he is never to be bathed.
Pair bonds and handling notes for the sitter
If your gerbil lives with a companion, the pair travels, sleeps, and stays together for the whole week — separating bonded Mongolian gerbils even briefly risks declanning, where they no longer recognise each other and may fight on reunion. Write that down in capitals if needed. Handling guidance matters too: gerbils are quick and startle easily, so the sitter should let them climb into cupped hands or a mug, and never grab or lift by the tail, which can injure the tail skin. Note that a secure, close-fitting lid is non-negotiable, because a gerbil's jump from an open tank is startlingly athletic.
What the sitter should watch for
Leave your vet's number, your contact details, and written permission for the sitter to arrange care if you are unreachable. Flag the specific changes worth a call: a gerbil who stops digging and sits hunched and fluffed, wetness or soreness around the nose from over-grooming, a companion pair suddenly fighting after being disturbed, or either animal not eating. Also reassure the sitter that brief upright scent-marking, thumping a hind foot when startled, and industrious midnight digging in a Mongolian gerbil are ordinary behaviour, not problems.
Setting up a KinsLe Care Pass for the week lets your sitter pull up the pair-bond warning, digging-bed depth, and sand-bath rule in one place, keeping your gerbil's desert routine intact until you are home.