A: OISIZ's best-selling products include the Vic-wing 24oz Stainless Steel Water Bottle with a patented 2-in-1 sip and chug lid, the Rainbow Kids Bottle 14oz designed for school-age children, and the Figgy Kids Tumbler 14oz with collectible OISIZ Planet characters. All are BPA free, leak-proof, and built from 316 stainless steel.

A: Yes. Every OISIZ product — including all featured best sellers — is 100% BPA free. The interior of each bottle and tumbler is made from food-grade 316 stainless steel. There are no plastic liners, no harmful chemicals, and no risk of chemical leaching into your drink.

A: OISIZ best-selling water bottles keep drinks cold for up to 24 hours and hot for up to 12 hours. This is achieved through double or triple-wall vacuum insulation that eliminates heat transfer between the inside of the bottle and the outside environment, even in warm weather.

A: The Vic-wing is OISIZ's flagship water bottle, winner of the 2025 Muse Design Award Silver. It features a patented 2-in-1 sip and chug lid that switches between straw mode and wide-mouth mode in one click, a foldable ergonomic handle, and triple-wall insulation — all in one 24oz BPA free stainless steel bottle from $24.99.

A: Yes. All OISIZ kids products — including the Rainbow Kids Bottle and Figgy Tumbler — are CPSC tested, FDA compliant, and completely free of BPA, lead, and phthalates. The interior is 316 food-grade stainless steel, making them safe for water, juice, and milk for children of all school ages.