Plastic shopping T-shirt bags are named for their T-shirt-like neckline and shoulder design, also known as "vest bags". The structural design makes them easy to carry, load-bearing and in line with usage habits:
I. Overall structure: vest-style handle design
Shape: The handle part is arc-shaped or "U"-shaped, similar to the neckline and shoulder contour of a T-shirt, which is convenient for fingers or arms to pass through and reduces the feeling of being squeezed.
Width: The handle width is usually 2-5 cm. The wider handle can disperse the weight and improve the comfort when bearing weight (narrow handles are easy to be squeezed, and wide handles are more labor-saving).
Connection method: The handle and the bag body are firmly connected by heat sealing or pressing technology. The connection is usually thickened or double-layered to avoid tearing when bearing weight.
2. Corner brace design
Position: The corner brace is located on both sides of the bottom edge of the bag, with a triangular or trapezoidal folding structure (similar to the bottom hem of an envelope bag).
Unfolding effect: When the bag is empty, the corner brace is in a folded state, and the bag is flat for easy storage; when the corner brace is opened when loading, a rectangular or square three-dimensional space will be formed at the bottom of the bag, so that the bag can be placed upright and the volume is significantly expanded.
Increase capacity: The bottom of the traditional vest bag is a straight line edge, and the interior is "wedge-shaped" when loaded, with low space utilization; after the corner brace is unfolded, the bottom becomes a flat surface, which can accommodate more items (especially large or irregularly shaped items, such as bottled beverages, boxed goods, etc.).
Improve stability: Bags with corner braces can stand upright on a flat surface to prevent items from tipping over, making it easier to load and display (such as more stable when placed at a supermarket checkout counter).
Disperse weight: The corner brace evenly distributes the weight of the items to the bottom and both sides of the bag by increasing the bottom contact area, reducing the pressure in the center of the bottom and reducing the risk of rupture.
3. Size adaptability
Design a variety of specifications: small (suitable for snacks and daily necessities), medium (commonly used in supermarket shopping), large (for large items or multiple items), to meet the needs of different scenarios.
4. Degradable materials
The environmentally friendly T-shirt bag uses degradable plastic (such as PLA polylactic acid). The structural design is the same as the traditional one, but it can be naturally decomposed after being discarded to reduce pollution.
5. Advertising printing area
A large blank area is reserved on the front or side of the bag, which is convenient for merchants to print brand LOGO, slogans or QR codes, combining practicality and marketing functions.
