Everyday wallet. When water shows up, unroll the bag, seal phone and keys, keep going.
From the Nereid catalog and the wallet sketch, IBC locks on one SKU: a slim card wallet with a permanently attached roll-top dry bag.
Stowed in a pocket. Deployed in seconds. No separate pouch to remember.
Parametric model from Northstar/Wallet — stowed, deployed, sealed.
Numbers from the CAD build — see design-spec for full BOM and dunk test plan.
Catalog D14 (soft rolltop + clear sensing window) stays as the stretch path if dunk demos prove people need to use the phone while sealed. v1 ships without the window.