So you think an estimate of the bag's length based on a casual glance outweighs the forensic evidence tying Oswald to the bag. His palm and fingerprint on the bottom of the bag. The fibers in the bag that matched the blanket Oswald used to store his rifle. Isn't it rather odd that no other bag was found in the TSBD.
Forensic evidence should always outweigh eyewitness accounts which are notoriously inaccurate.

lame
Frazier was sure of what he saw: Mr. BALL - You say he had the package under his arm when you saw him?
Mr. FRAZIER - Yes, sir.
Mr. BALL - You mean one end of it under the armpit?
Mr. FRAZIER - Yes, sir; he had it up just like you stick it right under your arm like that.
Mr. BALL - And he had the lower part--
Mr. FRAZIER - The other part with his right hand.
Mr. BALL - Right hand?
Mr. FRAZIER - Right.
Mr. BALL - He carried it then parallel to his body?
Mr. FRAZIER - Right, straight up and down.
Representative FORD - Under his right arm?
Mr. FRAZIER - Yes, sir.
FBI conclusions on markings and fibers in the bag: Mr. CADIGAN. "There were no marks on this bag that I could say were caused by that rifle or any other rifle or any other given instrument."
DPD on the prints on the bag: Mr. BALL. You say you dusted it?
Mr. STUDEBAKER. With that magnetic powders.
Mr. BALL. Did you lift any prints?
Mr. STUDEBAKER. There wasn't but just smudges on it - is all it was.
There was one little ole piece of a print and I'm sure I put a piece of tape on it preserve it.
Not very overwhelming. Is it?