Slice all vegetables — bell peppers into strips, cabbage shredded, carrot julienned, cucumber into rounds. Pat everything dry with paper towels.
Warm tortillas in a dry skillet for 20 to 30 seconds per side or microwave wrapped in a damp paper towel for 20 seconds (optional but recommended).
Spread ¼ cup hummus in an even layer across each tortilla, leaving a 1-inch border around the edges.
Layer spinach first, then arrange bell pepper strips, cabbage, carrot, cucumber, corn, and avocado across the center of the tortilla.
Fold the bottom edge up over the filling, tuck in both sides, and roll forward tightly to seal.
Slice in half on a diagonal with a sharp knife and serve immediately, or wrap in foil and refrigerate for up to 24 hours.