Is ThermoFlask on Sale? November 2026

Questions and answers

What sizes do ThermoFlask kids bottles come in?

The kids line runs 12 oz and 14 oz bottles, plus a 16 oz two-pack. The 14 oz models use a straw lid with a leak-proof seal. All are double-wall insulated stainless steel.

Are ThermoFlask kids bottles dishwasher safe?

The bottle bodies are hand wash only to protect the vacuum insulation. Lids and straws can go on the top rack. Hand washing the body keeps the insulation working.

Do the straw lids leak in a backpack?

The straw lids are designed leak-proof when the spout is closed. The silicone spout seals against the lid opening. Close the spout fully before packing it.

How long does a ThermoFlask kids bottle keep water cold?

Double-wall vacuum insulation keeps cold drinks cold for hours, and the sealed lid helps. Exact time depends on how full the bottle is and the outside temperature. It is not designed for hot liquids.

What warranty does ThermoFlask offer?

ThermoFlask backs its bottles with a limited lifetime warranty against manufacturing defects. It covers defects in materials and workmanship, not normal wear or damage from drops. Keep your proof of purchase for a claim.

Are there ThermoFlask discount codes?

Deal.ai checks what ThermoFlask products actually cost at every store, so a real markdown shows on this page as a deal as soon as it starts, and each product's page has its price history to tell a sale from its usual price.