Lightweight 32-64oz Flask Design

I’m creating a pair of insulated flasks—32 oz and 64 oz—that must keep drinks hot or cold for a full 24 hours. The body will be molded from BPA-free plastic rather than stainless steel so overall weight stays low without sacrificing durability. Key functional goals • A changeable sip head built around a Flip-top lid (no straw). If you can engineer the interface so that a future spout or twist-off cap could swap in without redesigning the whole neck, that would be a plus. • Triple anti-leak protection: I’m picturing a combination of high-tolerance threading, food-grade silicone gaskets, and a secondary internal seal, but I’m open to smarter ideas. • True light-weighting: target mass should beat comparable stainless bottles by at least 25 %. What I need from you – Concept sketches that show both sizes side-by-side, highlighting the lid interface and seal paths. – 3-D CAD files ready for injection-mold tooling (STEP or SolidWorks preferred). – A short thermal-performance calculation or simulation proving the 24-hour insulation claim with BPA-free plastic plus any vacuum or foam solution you recommend. – Exploded views and part count so manufacturing and assembly are clear. Your experience with plastic part design, thermal bottle engineering, and leak testing will weigh heavily in my decision. If you’ve solved similar hot/cold retention challenges or designed lids with modular inserts, let me see them. I’m ready to move quickly once the concept hits all the marks.

Project ID: 40248907