METRONIC Poly Mailers 12 x 15.5 in, 100-Pack Light Blue — Self-Seal, Water-Resistant Shipping Bags

These METRONIC light-blue poly mailers are 12 x 15.5-inch self-seal shipping bags sold in a 100-pack, built to be lightweight, water-resistant, and easy to seal for small-item fulfillment.

Whether you run an online boutique, ship gifts, or pack sample orders, packaging choices affect cost, presentation, and protection. METRONIC's colorful poly mailers combine a smooth exterior with tear- and puncture-resistant virgin polyethylene to keep soft, non-fragile items secure while reducing postage weight and packing time. The light-blue finish adds a memorable look that helps brand recognition without the bulk of a cardboard box.

How do these mailers protect products during transit?

METRONIC poly mailers use thicker virgin polyethylene that resists rips and punctures better than many thin plastic envelopes. The material is water-shedding, and each bag features a strong, tamper-resistant adhesive strip so packages stay closed through handling and weather exposure.

• Virgin polyethylene construction for improved tear resistance
• Water-resistant exterior to protect contents from moisture
• Strong self-seal adhesive to prevent accidental openings
• Smooth surface lowers friction and reduces snag risk in sorting

Will these mailers save on shipping costs and storage space?

Yes—poly mailers are significantly lighter and more compact than comparable boxes, which lowers dimensional and postage costs for soft goods. The flat, flexible profile also stacks neatly, helping you store large quantities without taking up warehouse or closet space.

• Lightweight design reduces postage fees for weight-based carriers
• Packs of 100 for efficient inventory and lower per-unit cost
• Foldable, space-saving shape for easy storage
• No tape required—peel-and-seal closure speeds packing

Which items are best suited for these 12 x 15.5-inch bags?

This size fits many small-to-medium soft goods and non-fragile items commonly sold online. Use these mailers for apparel, printed materials, accessories, and other goods that benefit from a light, protective envelope rather than box cushioning.

• Shirts, leggings, and other folded clothing
• Books, catalogs, and flat printed items
• Jewelry, scarves, small accessories in additional wrapping
• Office supplies, craft items, and sample packs

How do these bags contribute to brand presentation?

The light-blue color provides an immediate visual cue that can reinforce a store’s aesthetic and make unboxing feel intentional. A smooth surface accepts labels and ink well, helping printed or written addresses and branding stickers appear neat and legible.

• Distinctive light-blue finish for memorable unboxing
• Smooth face works with shipping labels and custom stickers
• Consistent color across the 100-pack supports brand cohesion
• Minimalist look that pairs with secondary packaging or tissue

Who is this for? METRONIC 12 x 15.5 light-blue poly mailers suit small business owners, online sellers, subscription services, and anyone sending soft or low-fragility items who wants a tidy, cost-effective shipping option. If you need packing that prioritizes speed, lower postage, and a clean presentation, this 100-pack is an economical choice. For fragile or breakable goods, pair these with padded inserts or choose a sturdier boxed solution.