How much does a ziplock bag weigh?

Many customers want to know the weight of ziplock bags. Here is our systematic summary of the weight of ziplock bags.

The weight of ziplock freezer bags according to variables such as material, size, thickness, etc.

By size

1. Small (15×20cm) ‌1.2-2.5g
2. Medium (20×25cm) ‌3.8-5.2g
3. Large (28×28cm) ‌8.5-12.3g

‌By thickness

‌1. Regular (0.01-0.03mm) Medium about ‌4.2g‌ Most supermarket basic models
2. Thickened (0.05-0.08mm) Medium about ‌7.8g Double seal strip ziplock bags

‌By material

1. LDPE (soft type) Medium ‌3.5-4.5g
2. HDPE (hard type) Medium ‌5.0-6.5g
3. PP composite material Medium ‌6.8-8.0g

‌Special structural components

1. Ordinary self-sealing strip Increase weight ‌0.6-0.8g
2. Double-track zipper seal Increase weight ‌1.2-1.8g
3. Reinforced rib bottom (explosion-proof design) Increase weight ‌15%-20%‌ Heavy-duty storage bag

Analysis of key influencing factors ‌

‌Material density difference ‌

LDPE density ‌0.92g/cm³‌ → about 18% lighter than HDPE (density 0.96g/cm³) of the same size

Environmentally friendly bags with calcium carbonate (weighting agent) are 10-15% heavier than pure PE bags

‌Precise thickness control ‌

For every 0.01mm increase in thickness, the weight of a medium-sized ziplock plastic bag increases by about ‌1.2g‌
Industry trend: Thinning through nano-coating technology

‌Environmentally friendly material comparison ‌

Traditional PE 4.5g Low cost but non-degradable
PLA+PBAT mixed 5.8g Biodegradable but 28% higher density
Recycled PE 4.2g The weight is similar, and the tensile strength is reduced by 15%

Industry weight reduction technology breakthrough

Micro-foaming process: Inject nitrogen micro-bubbles into the PE substrate, and reduce the weight by 12% without changing the thickness

Laser perforation sealing: Replace the traditional rubber strip, and the sealing structure reduces the weight by 40%

Ultra-thin barrier coating: Silicon oxide coating replaces multi-layer composite, and the vacuum bag is thinned to 0.06mm

Practical reminder: When purchasing ziplock freezer bags, check the “weight” (g/m²) marked on the package for more accuracy, for example:

Ordinary bags: 18-25g/m²
Freezer bags: 30-45g/m²
Industrial grade: 50g/m² or more

The following is our systematic summary of the weight of dense bags. If you need other technical support on zipper bags, please contact BAAAGS.