Depending on how the bag is constructed, a patch can be sewed on if you have someone you can take it to who can sew.
And to think, Home Economics was pushed off the curriculum as not being as "important" as other subjects. Cooking? Some simple sewing? Nah, that'll never be useful.
I'm reminded of that classic line by Val Kilmer in the movie,
Red Planet, in a tense moment when a group of astronauts that crash land on Mars need to calculate where they are so they can reach shelter.
"This is it. The moment they told us about in high school...where one day,
algebra would save our lives."