Size 14.5 x 19 is ideal for large items such as sweatshirts or t-shirts folded in half. There is a small gap on each side of the self-adhesive tape that I tape over to keep the loose ends out of the mailings. You can even cut it in half and use an iron on low (not steam) to seal the end with baking parchment paper (doesn't stick), making 2 smaller postal envelopes (just cover with 1 tape). So easy to ship that I've double-bagged some items for extra protection if they're fragile (like sweaters), oddly shaped (like stuffed animals) or travel long distances, and ship them for the same price. I like the distinctive turquoise color.
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