Hi, I picked up this old Nike sports bag recently. I think it is probably fake as it looks and feels cheap but it is also quite old. No tags, just the Nike wording and tick emblem on each end and one side. The bag is pretty small - about 14” length - but has quite a large extendable section at the bottom which seems strange if it is a cheap fake. Has got me wondering though, when would Nike have started producing sports bags and what would the tell-tale signs of a genuine but early bag be? Thanks.