5 in x 7 in Poly Mailer Envelopes - 1000 Count - Lightweight Shipping

In this review of the 5 in x 7 in poly mailer envelopes from GPI, the bottom line is simple: these are a practical, low-cost option for sellers and small businesses that ship non-fragile items like apparel and small accessories. The single biggest reason to buy is the combination of a tamper-evident permanent seal and a silver/grey inner lining that protects privacy while keeping shipping lightweight and inexpensive. The pack of 1000, with a 2.5 mil thickness, makes these mailers well suited to high-volume fulfillment where speed and protection from moisture matter more than padding.

Key Features

• Lightweight construction: The thin 2.5 mil polyethylene keeps shipping weight down so postage costs are reduced without sacrificing basic protection.
• Permanent adhesive seal: A peel-and-seal strip creates a tamper-evident closure that prevents reopening without visible damage.
• Privacy lining: The silver/grey inner lining conceals contents for confidential shipments of clothing or small goods.
• Durable seams: High strength flexible material and seams tolerate some over-stuffing and rough handling during transit.
• Water and dirt resistance: The virgin LDPE material shields contents from moisture, dust, and grime encountered in shipping.
• Compliance with parcel carriers: Self-sealing, non-resealable polymailers meet common carrier guidelines for unpadded mailers.

Who It's For

These mailers are aimed at small retailers, online sellers, and businesses that ship clothing, textile samples, small accessories, or other non-fragile goods in bulk. The 5 in x 7 in size is particularly useful for single small items, samples, or inserts that do not require cushioning.

Those who need padded protection, rigid boxes, or heavy-duty puncture resistance for sharp-edged or fragile products should look elsewhere; these are unpadded mailers best used where light weight and privacy are the priority rather than impact protection.

Pros & Cons

Pros

• Very cost-effective for high-volume shipping thanks to the 1000-count pack and low weight.
• Convenient peel-and-seal adhesive makes packing faster and removes the need for extra tape.
• Opaque inner lining protects customer privacy and reduces visibility of shipped items.
• Resists water and dirt so contents arrive cleaner than in paper envelopes.

Cons

• At 2.5 mil thickness some customers report the material can feel thin or flimsy for heavier or sharp items.
• Non-resealable design means mistakes during sealing cannot be fixed without damaging the bag.

Specifications

Quantity	1000 count
Usable size	5 in x 7 in
Thickness	2.5 mil
Material	Virgin low-density polyethylene (LDPE)
Closure	Peel-and-seal permanent adhesive strip
Inner lining	Silver/grey for confidentiality

Our Verdict

For merchants shipping lightweight, non-fragile items, these 5 in x 7 in poly mailers offer a practical balance of privacy, moisture resistance, and low shipping weight at an affordable per-unit cost. They are a solid choice for busy sellers who need speed and decent protection, but buyers needing padding or heavy puncture resistance should choose a different solution.

Frequently Asked Questions

Are these mailers padded?
No, these are unpadded poly mailers designed for non-fragile items and do not provide cushioning like bubble mailers.

Will the seal stay closed during transit?
The permanent adhesive creates a tamper-evident seal that will remain closed under normal handling and prevents resealing without visible damage.

Do these protect against moisture?
Yes, the LDPE material resists water, dirt, and dust, helping keep contents dry during shipment.