Get some 1000D Cordura to cut patches from.
Cut an inside and outside patch at least 0.5" wider than the outer edge of the hole.
Use Gorilla Glue to bond the patches. It will not come apart.
I carry a tube of Gorilla Glue on long backcountry camping trips for gear repair. Done right, you can fix just about anything with that stuff.
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"I feel like my world was classier before I found cyclocross."
- Mandi M.