If the back pack is cloth you could maybe dye it, but in my world paint sticks to anything I don't want it to. I see no reason why it would not stick. I'd use a latex paint if I did anything.
The thing around here is they take blaze orange cloth and they sew it to their jackets and their blinds. A good canvas, dyed blaze orange and then sewn to the pack should do the trick.
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, a total wreck, screaming Yahoo, with a big smile on your face."
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