Zippers are the small detail that decides whether your bag survives a year of real use or starts falling apart at the seams.
Laminated zippers, specifically
A laminated zipper pocket has a coated finish over the seam, which helps it resist fraying at the stitch line - the exact spot where a plain zipper pocket usually gives out first, especially on a pocket you open multiple times a day.
Where zippers matter most
Not every pocket needs to be bulletproof. The ones that matter are the ones you touch constantly - card slots, phone pockets, key clips. Those are the ones worth checking for reinforced construction before you buy.
A quick gut check
Next time you're bag shopping, unzip the smallest pocket a few times. Does it catch? Does the fabric already look strained at the seam in photos? That's usually a preview of month six, not month one.
Plexiana's small-item pockets are laminated for exactly this reason - they're the ones you'll open the most.