Gotcha. I have the x-small saddle sack in Royal and kind of want the banana sack for a handlebar bag and want them to match. My guess is the TrunkSack is photographed under artificial light and the banana sack looks to be shot out in the alley where they shoot all their bikes. I'd be surprised if Sackville used different materials for these two bags.
The best idea I can give anyone of color is this...oddly, the Newbaum's navy tape is VERY close to the royal color Sackville used on the x-small saddlebag.
Unrelated...I noticed you're in Raleigh? My sister-in-law lives there and my wife and I LOVE visiting...in fact, we were the week before Covid shut down the country. Huge fan of Trophy Brewing, Players Retreat, Rise biscuits...I could go on, but I'll leave it at this - I can't wait to visit Raleigh again!
Ben