foldable bottle

Common styles include wide‑mouth openings for easy filling and cleaning; dust‑proof or embedded lids that protect the drinking surface; and flip‑open spouts with sealing rubber stoppers on some collapsible bottles.

Weights vary by model: at least one flexible collapsible bottle is described as super‑light at under 2 ounces when empty, while other foldable options are generally noted as lightweight or ultra‑compact.

Capacities vary widely: small collapsible cups around 8 oz (240 ml); bottles and tumblers commonly at 16 oz, 20 oz, 23 oz, 32 oz and 37.2 oz; folding/titanium mugs list metric sizes from about 200 ml up to 1250 ml.

Several collapsible items are labeled BPA‑free or made from BPA‑free food‑grade materials. The silicone cup is described as 'BPA‑free,' and at least one flexible collapsible bottle is noted as made from sustainable BPA‑free food‑grade material.