Every liquid seller learns the same lesson once: one loose cap doesn't cost you one unit — it costs you the carton it soaked. ProShip3PL preps liquid products in Miami on containment logic: leak screening at intake, cap and seal verification by hand, every unit sealed in its own bag, bubble around glass, upright cartonization. If a bottle fails anyway, the failure ends at its own bag wall.
A carton of t-shirts with one flawed shirt loses one sale. A carton of body oil with one flawed cap loses the carton: the leak wicks through packaging, dissolves label adhesive on every neighboring bottle, and turns thirty sellable units into a damage claim. Liquids fail collectively — which is why they have to be prepped individually.
The failure sources are mundane. Caps torqued unevenly on a fast filling line. Induction seals that missed a bottle. Pumps that press themselves during a rough sort. Pressure and temperature swings on the truck between your co-packer and anywhere. None of it shows on a packing list; almost all of it shows to a person handling the bottles.
So the Medley liquid flow is built around hands and bags. Hands: leak evidence checked at intake, closures verified tight, seals spot-checked per lot. Bags: each unit sealed in its own poly containment, suffocation-warned where the size rules apply, glass bubbled on top of the bag. Cartons pack upright with separation, because orientation is free protection.
And since Amazon exited prep and labeling in January 2026, a liquid shipment that arrives leaking isn't quietly cleaned up — it's damaged inventory, and unprepped units sit outside reimbursement coverage. Containment has to happen before the shipment exists.
| Liquid failure point | Containment answer |
|---|---|
| Loose or cross-threaded caps | Hand-verified closures; suspect units pulled at intake |
| Missing induction seals | Seal spot-checks per lot before any bagging starts |
| Pumps & sprayers self-activating | Locked or off-position pumps, then sealed-bag containment |
| Glass breakage | Bubble over the containment bag; glass never rides on glass |
| One leaker soaking a carton | Per-unit sealed bags — a failure ends at its own bag wall |
| Sideways-packed bottles | Upright cartonization with fill; weight-capped heavy glass |
Damp cartons, stained shoulders, weeping threads, low fills — the evidence pass that catches transit failures before they enter your sellable count.
Closures hand-checked tight, induction seals and liners spot-checked per lot, snap-tops confirmed closed — the quarter-turn problem solved at the bench.
Every bottle sealed in its own poly bag, suffocation-warned where size rules apply — bag specifications live on our poly bagging page.
Glass bottles cushioned over the containment bag with the same standards as our fragile product prep — breakage and leakage handled as one problem.
Bottles packed standing with separation and fill, cartons weight-capped — orientation, the cheapest protection a liquid ever gets, never skipped.
Leaking arrivals isolated and photographed same-day, salvage separated from loss — the evidence package your supplier or carrier claim needs.
Arrivals leak-screened and counted against the PO; wet cartons isolated and photographed immediately.
Caps hand-tightened and checked, seals sampled, pumps locked or set to off before anything is bagged.
Each unit sealed in its bag, bubbled if glass, FNSKU and warnings applied on the dry outer layer.
Cartons built standing with separation and fill, then to the carrier within 24–48 hours of intake.
The classic liquid loss. Per-unit sealed bags cap the blast radius at one unit — the other twenty-nine stay dry, labeled and sellable.
Pumps press themselves in transit. Locked or off-position pumps plus bag containment means an activation wets a bag interior, not a customer's unboxing.
We can't fix the line, but the hand-check catches its output: loose caps found and tightened at the bench, patterned problems reported back to you with photos and counts.
Reasonable fear, solvable problem. Bag, bubble, separate, pack upright, cap the carton weight — glass liquids ship into FBA every week from this floor.
Liquids run through a containment-first flow: bottles are leak-screened at intake, caps and induction seals are verified, each unit is sealed in a poly bag so a failure stays inside its own bag, glass gets bubble protection, and cartons are packed upright with the FNSKU and any required labels applied over dry packaging. Amazon's liquid packaging requirements decide the specifics per product — we prep to the rules current at ship time.
Amazon's category requirements call for liquids to be sealed so they can't leak into the fulfillment center, and bagging is the standard way that's met — a unit in a sealed poly bag keeps its own failure contained. Where the bag's opening exceeds the size threshold, a suffocation warning applies. We track the current rule set and bag accordingly; the general specifications live on our poly bagging page.
We look for the evidence liquids always leave: damp or stained shipper cartons, residue on bottle shoulders, weeping around cap threads, low fill lines, and bulging or collapsed bottles that hint at pressure changes in transit. Suspect units come out of the flow, get wiped, re-checked and photographed — and if a lot shows a pattern, you hear about it the same day with pictures.
Yes — cap checks are the heart of liquid prep. We confirm caps are seated and tight, spot-check induction seals and cap liners across the lot, and make sure snap-tops are fully closed. A cap that's a quarter-turn loose survives your co-packer's dock and fails in an Amazon tote. Hand-checking closures is cheap insurance against the most common liquid failure there is.
Because liquid damage spreads and paper doesn't fight back. One failed bottle soaks the carton, delaminates labels on every neighboring unit, and can get the whole box treated as damaged at receiving — so you lose dozens of sellable units to a single bad cap. Per-unit bagged containment plus upright packing exists to break that chain: a leaker ruins itself and nothing else.
Glass bottles get the layered treatment: leak check, bag containment, then bubble wrap around the bagged unit, then cartonization with separation so glass never rides against glass. The bubble and cushioning standards come from our fragile product prep service — the same protection we give ceramics, applied over a liquid's containment bag. Heavy glass cartons also get weight-capped so the box itself survives.
They're their own risk class: pumps can activate under pressure in transit, and dip tubes make closures leak-prone. Where the design allows, we ship with pumps locked or in the off position; where the manufacturer includes a separate sealed cap for transit, we verify it's the one installed. Then the unit goes into a sealed bag regardless — so even an activated pump wets one bag, not one carton.
The containment logic is shared; the details differ. Sauces and consumable liquids add expiration-date labeling and FEFO thinking to the flow. Cosmetics lean on seal checks and presentation-safe bagging. Household liquids tend to be heavier, which drives carton weight caps. Note we don't handle dangerous goods — anything hazmat-classified or lithium-related is quoted case-by-case and usually declined.
We isolate the affected cartons, document everything with photos the day it lands, separate wet-but-sealed units from actual failures, and give you a same-day damage report you can take to your supplier or carrier while a claim is still viable. Salvageable units get wiped, re-checked and returned to the flow; genuine failures are counted and held for your disposition call.
Tell us what the liquid is, the container type and material (PET, HDPE, glass), unit sizes, monthly volume and where production ships from. Per-unit pricing including bagging and any bubble work comes back within one business day — no setup fee, no minimums, and a flag on anything in your lineup that needs a different route.
Tell us the product, the container material, unit sizes and monthly volume. Within one business day you'll have per-unit pricing with containment bagging and glass protection built into the number.
