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The Sistema Ultra is a small square-to-rectangular food container of about 0.7 fl oz (roughly 0.2 gal), built from Tritan plastic with a clip-lock lid. It is leak-proof, stackable, BPA-free and safe for the dishwasher, freezer and microwave, which puts it ahead of basic snap-lid tubs on versatility. Its tiny capacity suits snacks, sauces, dips and small leftovers rather than full meals. Owners of Sistema's Ultra line generally rate the latch seal and stackability highly, though some find the clips stiff and the small sizes less useful for batch cooking.
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Lowest price we've seen: $5.58 on Nov 9 at Walmart. Tracked across 1 store since Nov 9.
Owners of Sistema's Ultra containers praise the secure clip lid and stackable shape, and like that one tub handles fridge, freezer and microwave. The main complaints are stiff latches and the small size of the compact versions.
