At least five millennia passed between the invention of the wheel and the innovation of putting wheels under suitcases.

True if the earliest accepted dating of the wheel (about 3500 BCE or earlier) and the first wheeled suitcase (patents or products from about 1970, or earlier ones) are separated by at least 5,000 years. Mostly true if the gap is just under 5,000 years (e.g. 4,800–5,000) because of dating uncertainty. Mixed if it is roughly 4,000–4,800 years. Mostly false if it is markedly less, around 3,000–4,000 years. False if it is well under that.

Set before the research began.

1. E1 Wheel - Wikipedia Wikipedia · 5 September 2001

   “In Mesopotamia, depictions of wheeled wagons found on clay tablet pictographs at the Eanna district of Uruk, in the Sumerian civilization are dated to c. 3500–3350 BCE.”

2. E2 Wheel - Wikipedia Wikipedia · 5 September 2001

   “The oldest indirect evidence of wheeled movement was found in the form of miniature clay wheels north of the Black Sea before 4000 BCE.”

3. E3 Baggage - Wikipedia Wikipedia · 12 September 2004

   “The first rolling suitcase was invented by a French engineer, Maurice Partiot, who was living in the USA at that time. The patent was registered n° 2 463 713, March 8, 1949.”

4. E4 The first suitcases with wheels RetroWow · 5 October 2010

   “Theophilus Hokkanen filed the first patent for a suitcase with wheels in 1921.”

E1 dates the earliest depictions of wheeled wagons in Mesopotamia to c. 3500–3350 BCE, and E2 places indirect wheel evidence before 4000 BCE. E4 reports the first wheeled-suitcase patent was filed in 1921, and E3 cites a rolling-suitcase patent from 1949. Even using the latest wheel date (3350 BCE) and the earliest suitcase date (1921), the gap is about 5,270 years. That meets the criteria's threshold of at least 5,000 years.