Mainstays: what it’s actually made from

We have scored 4 Mainstays products. They average 18.2 out of 100 on materials, and the spread between the best and worst is 25 points.

Of those 4: not one names the surface that touches food; 0 state a country of manufacture; 0 have a materials claim backed by anything other than the maker’s own word.

Every Mainstays product we have scored

Product	Category	Score /100	What it is made of
Mainstays Food Storage Bento Container 42oz · US	Food storage	33	“BPA-free material” — the resin is never named · silicone seal ring named
Mainstays Kids 4-Compartment Bento Box · US	Lunchboxes	24	“BPA-free materials” — no resin named, on a children’s food container
Mainstays 13-Piece Nonstick Aluminium Cookware Set · US	Cookware	8	Aluminium body · “Interior: 2 layers non-stick coating” · “Exterior: high heat resistant c
Mainstays 7-Piece Nonstick Aluminium Cookware Set · US	Cookware	8	“Aluminum construction paired with a nonstick coating” · handle material not published

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: 33/100 means “coated, plastic, or unnamed”. The rubric is here.

Where these sit on the site

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