Safe to Use "Urine Bottle" Long-Distance Travel?

I've heard people (truckers, for ex.) use bottles to pee in their car for long-distance drives when they're in a rush or they don't have bathrooms nearby. If I did this for a multi-day trip, is the urine dangerous to keep in the bottle? Would it grow like massive bacteria?
Update: Also, would adding some rubbing alcohol (common disinfectant) into the bottle before I pee help kill bacterial in it)?
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