#poly mailers

Sea Essence Polymailers by PlantBasedYogurt

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If you run a small clothing brand, an online thrift store, or just sell your old clothes online, you know that shipping costs can eat up your profits fast.

One of the biggest mistakes new sellers make is using shipping bags (often called poly mailers) that are way too big or way too small for the items they are sending.

If the bag is too small, the seams can burst open during transit, or the customer might accidentally cut their new clothes when using scissors to open a tightly stuffed package. If the bag is too big, the extra plastic flaps around, making the package look messy, and shipping carriers might charge you extra because of the unnecessary bulk.

Here is a simple way to figure out exactly what size bag you need for different types of clothing so your orders look clean and arrive safely.

The Golden Rule: Flat vs. 3D

A shipping bag is completely flat when you buy it. But clothing is three-dimensional.

When you put a thick item like a folded hoodie inside a flat bag, the bag has to stretch wide to fit the thickness. This actually pulls the sides of the bag inward, making the bag shorter.

To find the right bag size, you can't just measure the flat clothing. You have to measure the length, width, and thickness (height) of the folded item.

To find the minimum width of the bag: Add the width of your folded clothing + the thickness of the clothing + 1 inch of extra wiggle room.

To find the minimum length of the bag: Add the length of your folded clothing + the thickness of the clothing + 2 inches (to make sure you can easily fold the sticky flap over to seal it).

Common Clothing Items and Bag Sizes

To make things easier, here is a quick cheat sheet of standard bag sizes that work best for everyday apparel items:

T-Shirts and Socks (Small Items): A single t-shirt or a couple of pairs of socks can easily fit into a 10x13 inch bag. This is the absolute staple size for any clothing store. It is lightweight, cheap, and fits almost any single light top.

Jeans and Sweaters (Medium Items): Denim and thin knitwear are heavier and thicker. A 12x15.5 inch bag gives you the extra width needed to slide stiff denim inside without tearing the sides of the plastic.

Hoodies and Jackets (Large Items): Thick winter hoodies or bulky jackets need space. Try a 14.5x19 inch bag or larger. Attempting to squeeze a thick hoodie into a medium bag will stretch the plastic white, making it easy to puncture during shipping.

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