The three consignment types
Straight (non-negotiable) B/L: consigned to a specific named consignee, who takes delivery on proof of identity. It cannot be transferred to another party and offers weaker payment security — suitable for prepaid, trusted, or intercompany moves. Seaway bills and express releases are non-negotiable by nature.
Order B/L: consigned 'to order' or 'to order of [bank/shipper]', it is negotiable — title passes by endorsement and delivery of an original, so it can be bought, sold, or pledged while cargo is in transit. This is the instrument behind letters of credit and the reason ocean freight retains paper originals. Bearer B/L: title passes by mere possession, with no named consignee — powerful and risky, so it is rare in practice.
Function vs form — two axes that get conflated
One axis is negotiability (straight vs order vs bearer); a separate axis is how release is controlled (original surrender, telex release, or seaway/express). A single shipment's B/L has a position on both: an order B/L released by courier of originals maximises control and payment security but risks demurrage if the originals arrive late; a straight seaway bill maximises speed with no title protection.
Choosing correctly is a payment-risk decision. Letter-of-credit trade needs a negotiable order B/L so the bank can hold title until documents are honoured. Established, prepaid relationships use straight/seaway bills to move faster and avoid courier costs. Getting this wrong is how exporters lose either their cargo control or a week to demurrage — and it is set at the SI stage, before the vessel sails.

