UboxesKitchen Moving Box & Supplies Kit #1 4 boxes with Dish/Glass Inserts

Are these boxes constructed of double wall corrugated? What is flute size and the burst strength?

How many dinner plates does each box hold?

boxes with cells for crystal stemware. Not the whole kitchen set, just for wine, water, ice tea and water goblets from 31/2" radius x 8" tall.

The top flaps are connected by a small tab of cardboard. How does this work for closing? Do you cut through it? Try to fold the tops over?