A supplement brand running a 1,200-unit gummy sample drop on a Sunday-night Shopify launch needs a 4 oz container that sits flat in a #2 poly mailer, opens one-thumb in front of an unboxing camera, holds a 6-week supply at the gummy density the contract filler ships, and looks like a finished retail SKU after a 2 in by 3 in pressure-sensitive label hits the lid. The 2924B29CLR — a 4 oz clear polypropylene hinged-lid container with an attached living-hinge cap — is the SKU that hits all four of those constraints from a single case-pack purchase, which is the entire reason it shows up on the cut sheet for ecommerce private-label brands instead of a two-piece jar-and-lid system.
What the 2924B29CLR Actually Is
A 4 oz (120 ml) clear polypropylene hinged-lid container with an integrated living-hinge cap that snaps closed and stays attached to the base for the life of the container. PP resin — Class VI USP Medical Grade polypropylene, the resin grade specified for medical and pharmaceutical primary packaging where extractables, leachables, and biocompatibility are tested under USP <88> in vivo and <87> in vitro. Lead-free. Latex-free. Crystal-clear sidewalls so the contents are visible through the wall without opening the lid. Lid is molded with a manufacturer marking on the inside surface. Listed at $1.01 per container (case pack 400; freight quoted separately to your delivery ZIP via the freight estimator at /freight-cost-estimator/ or by phone). MPN 2924B29CLR.
Why a Hinged-Lid Beats a Two-Piece Jar for Ecommerce Sample Distribution
A two-piece jar — separate base, separate lid — has two SKUs to inventory, two parts to align on a manual capping table, and a non-zero rate of lid-loss in the field. The hinged-lid 2924B29CLR is one part. One pick at the warehouse. One unit at the filling station. Zero lid-loss because the cap is part of the container. For a brand running 200-1,500 unit sample drops a week through Shopify, Faire, or an Amazon FBA workflow, the labor differential between two-part and one-part packaging compounds: at 200 fills per labor-hour on a one-part hinged lid versus 110-130 on a two-part jar-and-cap, the 4 oz 2924B29CLR pays for the 5-10 cent per-unit price premium over a low-grade jar within the first batch.
The Class VI USP Polypropylene Story
Polypropylene comes in many grades. Class VI USP is the grade specified by the United States Pharmacopeia for plastics intended for medical and pharmaceutical primary packaging. The USP <88> protocol tests the resin against six biological reactivity criteria including systemic injection, intracutaneous reactivity, and implantation in muscle tissue. Lead-free and latex-free, the resin meets the standard cleanroom material requirements and clears the typical compliance threshold for OTC supplement, cosmetic, and topical product packaging. For brands that send samples to influencer mailing lists, subscription unboxers, or retail buyer review programs, having a USP-grade primary container on the cut sheet is the difference between a one-line spec on the brand page ("USP Class VI medical-grade primary container") and the no-claim default that most low-margin ecommerce brands ship in.
Decoration and Private-Label Strategy
The 2924B29CLR has two label real estate zones: the lid (roughly 2.4 in diameter, takes a circular pressure-sensitive die-cut up to 2.25 in) and the sidewall (a 5.8 in by 1.4 in wraparound zone before overlap). Most private-label sample-drop brands run the lid label as the brand mark and the sidewall as the ingredient panel, batch number, and lot date. Pressure-sensitive labels on PP take well with standard waterborne acrylic adhesives — no surface-treatment required for the typical ecommerce SKU. Direct silk-screen and pad-print are also a fit for runs of 5,000-plus per color. For limited-edition seasonal drops, shrink-sleeve full-body wraps clear the lid hinge and let the brand do dual-language or holiday SKUs without re-tooling.
The 4 oz Sample-Drop Math
A typical gummy supplement weighs roughly 2.0-2.5 g per gummy at a 50-count count. At 50 count of 2.5 g gummies you fill the 4 oz / 120 ml container at about 60-70% by volume — leaving headspace for the desiccant and the cotton ball. For a powdered nootropic or pre-workout sample at a 7-14 day trial volume, the 4 oz sits well above the trial dose. For a topical balm or salve, the 4 oz holds 90-110 g of finished product depending on density. The container's footprint is 2.7 in diameter by 1.6 in tall closed — small enough to ship in a #2 (8.5 in by 12 in) poly mailer with kraft fill at USPS Ground Advantage rates instead of the larger box-rate that pushes shipping past the brand's free-ship threshold.
Case-Pack and Reorder Cadence
Case pack is 400 units per master case. For a brand running 800 fills a week, one case is a 2-week buffer; for a brand running 200 fills a week, one case is 8 weeks of inventory and stays inside the 6-month spoilage horizon for product touching topical or food-grade applications. The 4 oz hinged-lid is stocked at the manufacturer warehouse for next-business-day cut and 3-5 day LTL freight, which means inventory is not the constraint on a brand's growth ramp — confirm current case-stock and lead time on the call.
Closure Performance
The living hinge on a Class VI PP cap is rated for 1,000+ open-close cycles before fatigue failure. For a single-use sample container that gets opened by the customer 3-10 times before the contents are consumed, that fatigue rating is a non-issue. The snap-closure provides a tactile click that confirms the lid is fully seated — the same tactile feedback that tells a customer the container is closed and the contents are protected. There is no separate seal liner — the lid-to-base interface relies on the molded snap geometry. For applications that require a tamper-evident or moisture-barrier seal, an induction seal foil or shrink-band overcap can be added at the filling line.
Order Placement
Call 866-418-1777 to confirm case-pack quantity, freight class to your ZIP, and lead time on the 2924B29CLR. We quote case-pack pricing and freight in business-hours minutes — same call covers any matching liner, induction-seal foil, or labeling decoration setup if you want sample drops to ship as turnkey.
FAQ
What resin grade is the 2924B29CLR molded from?
Class VI USP Medical Grade polypropylene. USP <88> is the protocol that tests plastics intended for medical and pharmaceutical primary packaging against six biological reactivity criteria, and Class VI is the highest-tier classification under that protocol. Lead-free, latex-free. Suitable for primary packaging on OTC supplement, cosmetic, topical, and food-adjacent applications subject to your formulator's compatibility verification.
Is the lid actually attached, or does it come off?
Attached. The lid is a living hinge molded as part of the base — the cap and the container are a single piece of polypropylene with a thin flexure that connects them. The lid snaps closed and snaps open, but it does not detach. That eliminates lid-loss in shipping and at the customer end.
What is the case pack and minimum order on the 2924B29CLR?
Case pack 400 containers per master case. Minimum order is one case (400 units). Multi-case orders ship at LTL freight rates on full pallets. Call 866-418-1777 for full-pallet case counts and freight pricing.
Can the container be private-labeled with our brand?
Yes. The lid takes a circular pressure-sensitive die-cut label up to 2.25 in diameter. The sidewall accepts a wraparound pressure-sensitive label up to 5.8 in by 1.4 in before overlap. Direct silk-screen and pad-print are available for runs of 5,000+ per color. Shrink-sleeve full-body labels are also a fit for limited-edition or seasonal SKUs.
What is the freight policy on this case pack?
Listed price is the per-unit list. LTL freight is quoted separately to your delivery ZIP through our freight estimator at /freight-cost-estimator/ or by phone at 866-418-1777. Pallet rate, residential delivery surcharge, and lift-gate are quoted at the same time. Freight is not bundled into the listed unit price.
How does the hinged-lid hold up over multiple open-close cycles?
The living hinge on a Class VI PP cap is rated for 1,000+ open-close cycles before fatigue failure. For a single-use sample container that customers open 3-10 times before the contents are consumed, fatigue is not a constraint. The snap-closure provides a tactile click that confirms full seating.
Does the 2924B29CLR include an induction-seal foil or tamper-evident band?
No, not by default. The lid-to-base interface is a molded snap that does not include a separate liner or seal. For applications that require a moisture-barrier or tamper-evident seal, an induction-seal foil disc or shrink-band overcap can be added at the filling line. Call to confirm compatible liner and shrink-band stock and per-unit pricing.
Sources cited: USP <88> Biological Reactivity Tests, In Vivo (Class VI), OneSource Plastics 2924B29CLR technical specification
