How Flexible Bags Simplify Lab Inventory

Storing liquid sampling containers can take up valuable space for dairy processors. Rigid plastic bottles and glass jars eat up shelf space long before they’re even filled.

Switching to flexible sampling bags frees up significant storage space for manufacturers and simplifies inventory, without sacrificing sample integrity.

There are many things to consider when making the change, but here are the three main concerns we see:

• Leaky shipments during transit
• Messy pouring on the Bench
• Cross-contamination during transit: Micro-leaks or loose lids on nearby traditional containers (like glass jars or plastic bottles) can spill during transport

Whirl-Pak bags were engineered specifically to solve all three—combining leak-proof wire closures, self-standing designs, and guaranteed sterility into a single, space-saving format.

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Better Standard Sampling Starts Here

Whirl-Pak’s standard bags set a solid baseline for flexible sampling, delivering high-reliability performance while freeing up valuable storage space. These bags are thoughtfully designed for routine lab use, featuring:

• Secure closure tabs: Keep samples leak-tight and safe during storage and transit.
• Continuous perimeter seals: Provide maximum leak resistance and structural integrity.
• Pre-sterilized: Manufactured sterile for contamination-free sample collection.
• Versatile sizing: Available in a wide range of volumes to fit diverse testing protocols.

Flexible Sizing Options:

• 2-oz (59-mL): 3” x 5” (7.5 x 12.5 cm)
• 4-oz (118-mL): 3” x 7.25” (7.5 x 18.5 cm)
• 7-oz (207-mL): 3.75” x 7” (9.5 x 18 cm)
• 13-oz (384-mL): 5.25” x 7.5” (13 x 19 cm)
• 18-oz (532-mL): 4.5” x 9” (11.5 x 23 cm)
• 24-oz (710-mL) 3 mil: 6” x 9” (15 x 23 cm)
• 24-oz (710 mL) 4 mil : 6” x 9” (15 x 23 cm)
• 27-oz (798-mL): 5” x 12” (12.5 x 30.5 cm)
• 36-oz (1,065-mL): 5” x 15” (12.5 x 38 cm)
• 42-oz (1,242-mL): 6” x 15” (15 x 38 cm)
• 55-oz (1,627-mL): 7.5” x 12” (19 x 30 cm)
• 69-oz (2,041-mL): 7.5” x 15” (19 x 38 cm)

One Container for Multiple Regulatory Needs

Beyond standard sampling, Whirl-Pak offers specialized bags designed to replace costly, purpose-built rigid containers. Matching the right bag to your specific protocol helps streamline your inventory and lower your overall cost per test.

Key Specialized Options:

• Stand-Up Bags Feature a gusseted bottom that keeps them upright when filled, eliminating the need for rack systems or extra hands while pipetting at the bench.
• Filter Bags: Built with an interior porous membrane that automatically separates solids from liquid during homogenization, saving an entire manual filtration step.
• Flat Thio-Bags: Pre-dosed with active sodium thiosulfate to instantly neutralize chlorine in water samples, replacing bulky, pre-treated glass bottles and eliminating the risk of breakage.
• Blender Bags: Made from heavy-duty, tear-resistant film designed to withstand stomachers and homogenizers during high-volume microbiology prep.
• Black Bags: Constructed from opaque black film to completely block light, offering a lightweight, shatterproof alternative to expensive amber glass bottles for light-sensitive compounds.

Built for Regulatory Compliance Across Industries

Because these specialized bags meet strict sterility and operational standards, a single flexible system can support your entire workflow:

• Water & Wastewater: Collect effluent, storm runoff, and chlorinated tap water without dragging around fragile glass containers.
• Environmental Fieldwork: Pack hundreds of lightweight, shatterproof sample bags into a single field kit.
• Food & Beverage: Maintain sterile handling standards for raw milk, dairy processing, and liquid ingredient testing.
• Pharmaceuticals & Life Sciences: Ensure contamination-free containment for purified water loops and raw material QA testing.

Optimize Your Sampling Process

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Everyday Handling: Sealing and Identification

Beyond flexible sizing, the physical construction of Whirl-Pak bags addresses the routine friction of handling, sealing, and tracking samples on the bench.

Simple to Open, Built to Stay Sealed: Sample integrity depends on a reliable seal. Whirl-Pak uses a signature whirl-close design paired with puncture-proof wire tabs to create a leak-resistant barrier, securing samples during transit without damaging gloves or risking cross-contamination.

Traceability Made Simple: Reliable sample tracking is non-negotiable. Whirl-Pak Write-On bags feature a matte white strip specifically engineered to accept standard pens, lab markers, and pencils. The surface resists smudging, moisture, and condensation, keeping your sample details legible through transport, benchtop handling, and cold storage.

Find the Right Setup for Your Lab

Have questions about specs or ordering? Visit our FAQ & Nelson-Jameson Answers. Whether you are ready to upgrade your inventory or want an expert review of your current workflow, we are here to help!