poly delivery bag, also known as a poly mailer or courier bag, is a type of packaging used primarily for shipping and delivering items. These bags are made from polyethylene, a type of plastic, which makes them lightweight, durable, and water-resistant.

Here are some key features and uses of poly delivery bags:
### Features:
1. **Material**: Typically made from low-density polyethylene (LDPE) or high-density polyethylene (HDPE).
2. **Water-Resistant**: Protects contents from moisture.
3. **Tear-Resistant**: Durable and less likely to tear compared to paper envelopes.
4. **Lightweight**: Reduces shipping costs.
5. **Self-Sealing**: Many come with a self-adhesive strip for easy closure.
6. **Customizable**: Can be printed with logos, addresses, and other information.
7. **Recyclable**: Some types of poly bags can be recycled.

Uses:
1. **E-commerce**: Widely used by online retailers for shipping clothing, books, and other non-fragile items.
2. **Courier Services**: Used by delivery companies for documents and small packages.
3. **Subscription Boxes**: Popular for subscription-based services that send out monthly or periodic deliveries.
4. **Mail Order**: Used for direct mail and catalog orders.
5. **Food Delivery**: Some food delivery services use poly bags to keep food items dry and secure.

Advantages:
- **Cost-Effective**: Generally cheaper than boxes and more traditional packaging materials.
- **Space-Saving**: Flat when not in use, making them easy to store.
- **Versatile**: Suitable for a wide range of items, from soft goods to small, rigid items.
