SUNPACK 72-Cell Extra-Strength Insert - Square Cells - Fits Standard 1020 Trays - 21.25in L x 11.25in W

Reinforced 72-Cell Insert Built to Survive Fully Loaded Transport

The SUNPACK 72-Cell Extra-Strength Insert trades the Plug Flat line's food-grade certification for a heavier-gauge build engineered to survive the weight of fully loaded cells during transport rather than sitting undisturbed on a bench. Its square cells span a 21.25in L x 11.25in W footprint that still drops into any standard 1020 propagation tray.

Where the Plug Flat insert is built around edible-crop safety, the Extra-Strength insert is built around handling abuse: carrying a full flat from headhouse to bench without the walls buckling under the weight of wet media and rootballs. Square cells keep that same media volume advantage that square cells offer, keeping plugs organized for uniform transplanting even after a bumpy ride to the bench.

Key Features & Benefits

• 72 square cells — The squared-off shape packs more growing media into each cell and lines plugs up evenly for a uniform transplant pass.
• 21.25in L x 11.25in W footprint — Fits any standard 1020 (10in x 20in) propagation tray for seamless integration into existing bench systems.
• Extra-Strength reinforced build — Engineered to withstand the weight of fully loaded cells during transport, reducing breakage and media spills.
• Multi-season durability — Quality materials hold up through repeated use, cleaning, and sterilization cycles for reliable long-term performance.
• Universal 1020 fit — Slides into any standard 10in x 20in tray without requiring a specific brand or bench match.

Who Should Use This

Growers who move fully loaded flats across a facility, rather than leaving them undisturbed on one bench, are the reason the Extra-Strength line exists. Commercial operations transporting trays between a headhouse and greenhouse benches see the biggest benefit from the reinforced build.

Compatibility & Certification

This square-cell insert fits standard 10in x 20in (1020) propagation trays and works with peat, coco coir, and soilless plug mixes under overhead, bottom-watering, or flood-and-drain irrigation. Unlike the Plug Flat insert line, the Extra-Strength material is not specifically certified food-grade or BPA-free; growers needing that certification for edible crops should choose the Plug Flat insert instead. A round-cell version of this Extra-Strength insert is also available.

Frequently Asked Questions

Do these inserts drop into a standard 1020 tray?

Yes, the 21.25in L x 11.25in W footprint is sized to drop into any standard 10in x 20in propagation tray. That includes SUNPACK trays as well as most other brands' standard nursery flats.

How is this different from the SUNPACK Plug Flat insert?

The Extra-Strength insert uses a heavier-gauge build engineered to withstand the weight of a fully loaded flat during transport, while the Plug Flat insert is certified food-grade and BPA-free. Pick Extra-Strength when trays get moved often and pick Plug Flat when food-grade certification matters most.

What is the benefit of square cells?

The squared-off shape packs more growing media into each cell and lines plugs up evenly for a uniform transplant pass. That geometry carries over from the Plug Flat line, so the choice between square and round comes down to how your crop develops its root ball rather than any change in tray strength.

Are these inserts food-grade or BPA-free?

No specific food-grade or BPA-free certification is claimed for the Extra-Strength material. Growers who need that certification for edible-crop production should choose the SUNPACK Plug Flat insert line instead.

How many growing seasons will these inserts last?

SUNPACK Extra-Strength inserts are built for multi-season use. With proper cleaning and storage between uses, they reliably hold up through repeated growing cycles.