Banana: Bruise-Free Packing with the Biopac MAP Bag
Standard vacuum packs for banana cartons need the plastic torn or stripped away at the hand holes to fit the bunch through. It’s a small step in the packing line, but it’s also a bruise and scar risk that happens before the fruit has even left the plant. Sumifru Philippines’ New Products team ran an independent trial in 2011 to test whether Biopac’s specially designed vacuum bag — built with hand holes that don’t need tearing or stripping — could hold up through a full ripening cycle without any loss of fruit quality.
The Packing Problem With Standard Vacuum Bags
Fitting a banana bunch through a standard vacuum bag usually means tearing or stripping plastic around the hand holes so the crown clears the opening. That operation puts pressure directly against the fruit at exactly the point where it’s most exposed, and it’s a common source of bruising and surface scarring that shows up later in the box, not at the point of packing.
The Trial
Sumifru Philippines (New Products, Jan Gilbert S. Murao II) tested the Biopac bag’s hand-hole design against this problem directly. The objective was straightforward: validate that bananas would ripen normally and reach acceptable quality without tearing or stripping the vacuum pack during packing.
The Biopac bag’s hand-hole opening is designed to clear the crown without tearing or stripping the plastic. Source: Sumifru Philippines trial report.
Ripening Results
Bananas packed in the Biopac bag turned yellow following the New Zealand ripening pattern normally, with no tearing or stripping required at any point in the process. Moisture in the peel was observable three weeks after harvest, and the pulp remained firm. Peel colour change was delayed by one day compared to the standard vacuum pack — a difference worth factoring into ripening room scheduling rather than a quality concern in itself.
Appearance at colour 5 — moisture visible in the peel, consistent with normal ripening.
Brix and Firmness
An independent samples t-test (n=34) found statistically significant differences between the two pack types on both brix and hardness (p=.001 for each). The standard vacuum pack produced fruit with higher brix but softer pulp; the Biopac bag produced fruit with lower brix but firmer pulp at colour 5.
| Pack Type | Brix, Colour 5 (%TSS) | Hardness, Colour 5 (kg/cm³) | Brix, 72hrs After Colour 5 | Hardness, 72hrs After Colour 5 |
|---|---|---|---|---|
| Standard vacuum pack | 17.60 | .42 | — | — |
| Biopac bag | 16.16 | .45 | 18.76 | .34 |
Bruise and Scar Reduction
Because the Biopac bag removes the tear/strip step entirely, bruising and scarring linked to that packing operation were avoided. This matters most at the point of packing, where fruit is handled most and quality damage is hardest to catch before it’s boxed and shipped.
Shelf Life and Crown Condition
At 72 hours after colour 5 (held at 18°C), crown rot was present but not severe, and some neck dehydration was observed. Worth monitoring on longer transit windows, but not a disqualifying result at this shelf-life point.
Why Ethylene Control Matters Alongside the Bag
Bananas are a climacteric fruit — they produce their own ethylene as they ripen, and that ethylene accelerates further ripening in a self-reinforcing cycle. Inside a sealed bag like the one tested here, any ethylene the fruit produces has nowhere to go, which is exactly why the packaging problem and the ethylene problem are connected rather than separate. Pairing the Biopac bag with a Fresh Up® ethylene absorber sachet or filter gives the sealed environment somewhere for that ethylene to be neutralised, rather than accumulating and pushing the fruit toward faster, less even ripening.
The Practical Takeaway
This independent Sumifru Philippines trial validates a design detail that’s easy to overlook: how a bag fits around the crown matters as much as the barrier properties of the film itself. The Biopac bag’s hand-hole design removed a manual tear/strip step that’s a known bruise risk, while fruit still followed a normal New Zealand ripening pattern and reached firmer pulp at colour 5 than the standard vacuum pack. Crown condition at extended shelf life is worth watching on longer routes, but the core packing-quality question the trial set out to answer — does removing the tear/strip step compromise the fruit — came back negative.
