Quick Answer: Choosing polyethylene packaging comes down to four factors: your product’s weight and physical properties, the correct film thickness in microns, the right resin type (LDPE or HDPE), and whether custom printing is needed. Matching these four variables to your actual product and handling conditions ensures you get packaging that performs reliably without overpaying.
Choosing the right packaging material is one of the most important decisions a manufacturing or retail business can make — and yet it is often the decision that receives the least attention. When it comes to polyethylene packaging, the options can feel overwhelming: different film thicknesses, bag types, sealing methods, and print configurations all affect the final result in ways that are not always obvious.
Whether you are packaging food products, industrial goods, agricultural produce, or e-commerce shipments, getting the packaging right from the start saves money, reduces product damage, and strengthens your brand. This guide covers the key factors to evaluate before placing an order.
Start With Your Product — Not the Packaging
The most common mistake businesses make is starting with price and ending up with the wrong product. Before comparing materials or suppliers, map out the basic requirements of what you are packaging.
How heavy is the product? A 25-kilogram pellet bag needs much thicker film and stronger weld seams than a bag of bread rolls. What conditions will the packaging face during transport and storage? If exposed to moisture, UV radiation, or temperature swings, the film specification must account for this. Does the product have sharp edges or an irregular shape? Puncture resistance becomes a priority. Will filling and sealing be done by hand or by machine? Machine-compatible bags have different dimensional tolerances and opening styles.
Answering these questions before looking at product specs will immediately narrow your options and prevent costly mismatches.
Understanding Film Thickness: Microns Matter
Polyethylene film thickness is measured in microns (μm). The higher the micron count, the thicker and stronger the film — but also the heavier and more expensive per square meter. The right thickness is the minimum that safely does the job.
For light consumer packaging such as bread bags or small retail bags, films between 20 and 50 microns are typically sufficient. Courier envelopes and polymailers used in e-commerce typically require 50 to 70 microns. Agricultural sacks and pellet bags typically need 80 microns and above, with heavy-duty variants reaching 150 microns or more. Greenhouse and agricultural covers use even thicker films optimised for UV resistance and long outdoor exposure.
If you are unsure about the right specification, a reliable manufacturer will run a needs analysis and recommend the correct micron count based on your product and handling environment. RB Plast’s technical team in Kocherinovo carries out this assessment as a standard part of the quoting process.
| Application | Recommended Thickness | Key Requirement |
| Bread bags / small retail bags | 20–50 microns | Clarity, easy sealing |
| Courier envelopes / polymailers | 50–70 microns | Tear resistance, water resistance |
| Branded carry bags (fashion / retail) | 50–80 microns | Print quality, handle strength |
| Agricultural sacks / pellet bags (up to 15 kg) | 80–120 microns | Seam strength, puncture resistance |
| Commercial pellet bags (15–25 kg) | 120–150 microns | Heavy load, gusseted walls |
| Greenhouse / agricultural film | 100–200 microns | UV stabilisation, outdoor durability |
Table 1: Recommended polyethylene film thickness by application. Source: RB Plast technical specifications.
LDPE vs HDPE: Choosing the Right Resin
LDPE (low-density polyethylene) is soft, flexible, and highly transparent. It seals easily and is the standard material for most bags, sleeves, courier envelopes, and food packaging films. It stretches without tearing and has excellent clarity — important when visual presentation matters.
HDPE (high-density polyethylene) is stiffer and stronger at lower thickness. It has a slightly milky or crinkly appearance and produces a characteristic rustling sound. It is commonly used for grocery bags, agricultural sacks, and applications where tensile strength matters more than clarity. HDPE achieves equivalent strength at lower thickness, making it more cost-efficient for certain high-volume applications.
For pallet stretch wrapping, a separate category — linear low-density polyethylene (LLDPE) — is used, engineered specifically for maximum elongation and cling.
The Case for Custom Flexographic Printing
If your packaged product reaches the end consumer directly, plain unbranded packaging is a missed marketing opportunity. Flexographic printing on polyethylene film allows you to add logos, brand colors, barcodes, product information, and graphic elements at production scale — and it is accessible to small and medium-sized businesses, not just large manufacturers.
At RB Plast, we offer flexographic printing up to 2 colors on film widths of up to 1,500 mm, with in-house design support for clients who need artwork developed from scratch. Research consistently shows that professional packaging increases perceived product value, drives repeat purchases, and generates word-of-mouth — particularly for e-commerce businesses where the unboxing moment is a documented driver of customer loyalty.
Minimum Orders, Lead Times, and Working With a Manufacturer
Custom polyethylene packaging is produced in runs based on specific dimensions, thicknesses, and print configurations. For plain, standard-format products, smaller quantities may be available from stock. For custom-printed or custom-dimensioned orders, production lead times at RB Plast typically run one to three weeks depending on complexity.
One of the clearest advantages of sourcing directly from a manufacturer like RB Plast — rather than a distributor — is end-to-end control: extrusion, printing, and bag-cutting all happen in our own facility in Kocherinovo. This means faster turnaround, greater flexibility on specifications, and direct access to technical expertise when you need it.
Frequently Asked Questions
Q: What is the minimum order quantity for custom-printed polyethylene bags?
A: Minimum order quantities vary depending on the specification. For standard formats, smaller quantities may be available from stock. For custom-printed or custom-dimensioned orders, MOQs typically start at a few thousand units. Contact RB Plast at sales@rbplast.bg to discuss your specific requirements.
Q: What is the difference between LDPE and HDPE packaging?
A: LDPE is soft, clear, and flexible — the standard choice for food bags, courier envelopes, and retail carry bags. HDPE is stiffer and stronger at lower thickness, typically used for grocery bags and agricultural sacks where tensile strength is the priority.
Q: Can RB Plast produce bags in custom sizes and colors?
A: Yes. RB Plast produces polyethylene packaging to custom dimensions, thicknesses, and colors, with flexographic printing in up to 2 colors. Our technical team can advise on the optimal specification for your product.
Q: Where is RB Plast’s production facility located?
A: RB Plast manufactures polyethylene packaging at its own facility in Kocherinovo, Bulgaria, with a sales office in Sofia. The company serves both the Bulgarian market and international clients across Europe.
To discuss your packaging requirements, contact RB Plast at sales@rbplast.bg or call +359 887 584 300.
