Frequently Asked QuestionsWhat are 2 mil Clear Line seal top bags with a write-on block?They are 2 mil thick reclosable poly bags with a single track zipper and a white printed panel you can write on. The rest of the bag is clear film, so you can see the contents while the write-on block holds a product name, weight, date, or lot number without a separate label. What can you write on the write-on block?The white write-on area accepts ballpoint pen, permanent marker, or grease pencil. A fine-tip permanent marker gives the cleanest result. The panel is printed to hold ink rather than bead up the way bare polyethylene does. Are these bags food safe?Yes. LK Packaging makes these bags from virgin polyethylene resin that meets FDA requirements (21 CFR 177.1520) for direct food contact. They are used for dry goods, baked items, produce, candy, and prepared foods. Can the zipper be resealed over and over?Yes. The single track zipper is built for repeated opening and closing, which is why these bags suit items accessed daily rather than sealed once and shipped. Seal strength holds up through normal repeated use; a double track zipper is the better choice for long-term storage. What is the difference between single track and double track zipper bags?A single track zipper has one interlocking channel and opens easily, which makes it ideal for daily access and retail display. A double track zipper has two channels for a tighter, more secure closure, better for long-term storage and shipping. Single track costs less per bag. Should I buy 2 mil or 4 mil seal top bags?Choose 2 mil for everyday retail, food, and light parts use where cost per bag matters and the contents are not sharp or heavy. Choose 4 mil when you are bagging heavier items, sharp hardware, or bags that get handled repeatedly, since the thicker film resists punctures and tears. Who uses seal top bags with a write-on block?Bakeries, delis, and candy shops label weight and date; hardware stores and manufacturers label SKUs and part numbers; hospitals and labs label specimen and sample IDs; e-commerce packers write order or batch numbers at the packing station. Any operation that would otherwise print and stick a label can skip that step. Applications & Use Cases
Food Packaging
Bakeries, delis, and candy shops use these bags for cookies, bagels, nuts, dried fruit, and bulk foods. The write-on block allows you to note product name, weight, price, and date. Clear line visibility shows customers what they're buying without opening the bag.
Retail & E-Commerce
Perfect for small parts, craft supplies, jewelry, cosmetic samples, and hardware. Write SKU numbers or product codes directly on the bag. The clear window lets customers verify contents while the zipper prevents spills during shipping.
Medical & Lab Supplies
Hospitals and labs use these for specimen samples, swabs, and small instruments. Label patient info or sample ID on the write-on block. FDA-compliant materials ensure safe handling of medical items.
Sizing Guide
Available in multiple sizes to fit your products. Bag dimensions are measured width × length (opening to bottom). Common sizes include:
- 4" × 6": Jewelry, coins, small parts
- 6" × 9": Baked goods, candy, bolts/nuts
- 9" × 12": Clothing, documents, larger food items
- 12" × 15": Bulk packaging, industrial parts
Measure your product and add 1" to width and 2" to length for comfortable fit and sealing room.
LK Packaging Quality
LK Packaging (formerly Elkay Plastics) has manufactured poly bags in the USA for over 60 years. Their Clear Line series is known for consistent clarity, strong seals, and reliable quality control. All bags are inspected for defects and backed by manufacturer warranty.
Bulk Pricing & Wholesale Orders
Prism Pak offers wholesale pricing on full case quantities. The more you buy, the more you save. Need a custom size or private labeling? Contact us for a quote. Volume discounts available for recurring orders.
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