After a shift on Tuesday I was driving home behind a P6. I noticed a hazmat paper fly out the right side door. I dont know what to think or say, other then " well that could cost UPS 30,000, a warning or worse to a driver or PT if they get stopped or get into a crash ". I really think that the cups in the car cab cant handle a hazmat paper. It seems to fly out due to wind within the cab. I had a driver who got into a wreck, where a semi t-boned him, the car came crashing to one side. I saw the wreck too, since I picked a different path from work ( one a million chance ), and I knew there was a hazmat onboard and even saw papers fly out of the cab and car. The question is, where can I bring this up to leadership on the inside to change the cup within the cab? I've often said there needs to be a open and close clip on those cups. I need, we all need, to bring this up. Keeping a hazmat in those cups on inspections and crashes should be a forced issue. They fall out too easily.