Canvas tears happen, usually at the worst moment. A small field-repair kit turns a ruined night into a minor interruption.
Stop the tear from spreading
Before anything else, stitch a simple whip stitch across both ends of the tear to stop it running further along the weave.
Patch, then proof
Apply a self-adhesive canvas patch on the inside face, press it firmly from both sides, and re-treat the area with wax once you are home.

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