You were looking for an old Nutella jar however it's been muggled! :(
So now the cache is slightly smaller with little room for much more than the log book. You're looking for a small round plastic container, slightly larger than a 35 Mil film canister, with a sealable flip top.
Bring your own writing stick.
Please take the time to return the cache as you found it. We hope doing so will help reduce the prospect of future muggling.