The TiZip on your packrack offers up some awesome storage possibilities for your trips.
But - the TiZip needs to be looked after for it to provide you with a long life of service.
TiZip have some suggestions over here - https://tizip.com/storage-cleaning-maintenance/
We sell a Silicone Grease suitable for lubrication - many users suggest applying it after every trip - https://www.marine-deals.co.nz/gear-aid-silicone-grease-7g
Here is a great video on looking after the zips as well as packing tips: