If you slash your ChillO there is still hope!
Tear-aid® works great on both the liner and the outer fabric.
If the liner is torn badly you may need a replacement liner.
Tear-aid is clear in colour, water proof, and doesn't get sticky in the sun. Seems a great product.
We have patches available custom cut to your damage or you can just get Tear-aid from eBay or a camping store.
Contact us and we'll tell you how to do it and how much you need (we don't do this for profit but as a service)