Yumbox: what it’s actually made from

We have scored 3 Yumbox products. They average 47.0 out of 100 on materials, and the spread between the best and worst is 40 points.

Of those 3: 1 name the surface that touches food at least to a material family; 0 state a country of manufacture; 1 have a materials claim backed by anything other than the maker’s own word.

That spread is the thing worth noticing. The same company publishes enough about Yumbox Prêt Stainless 4 Compartment (Biome) for it to score 73, and so little about Yumbox Tapas 5 Compartment (plastic) that it scores 33. Disclosure here is a per-product decision, not a house style.

Every Yumbox product we have scored

Product	Category	Score /100	What it is made of
Yumbox Prêt Stainless 4 Compartment (Biome) · AU	Lunchboxes	73	18/8, 304 stainless tray · silicone compartment seals · lid polymer not published
Yumbox Original Leakproof Bento · US	Lunchboxes	35	No resin named on any page — only “high-quality, safety-tested materials” · “silicone-line
Yumbox Tapas 5 Compartment (plastic) · AU	Lunchboxes	33	Plastic tray and shell — no resin named anywhere · silicone seal

Click a product to read the full record — the exact wording the maker uses, what is missing, and every source. Scores are out of 100 and measure materials, not safety: 73/100 means “mostly inert”. The rubric is here.

Where these sit on the site

Yumbox appears in Lunchboxes. The Australian and American editions are scored the same way, so a product marked AU and one marked US are directly comparable.