Storage is useful when it holds living-room essentials without adding another cabinet. First decide whether you need a seat, a place to stretch your legs or a guest bed. These are different uses even when all include storage.
A compact two-seater
The dark-grey HOMCOM 135 cm has underseat storage and a 135 × 71 cm footprint, with an 84 cm height. It offers a place for frequently used textiles. This is a fixed sofa, not a sofa bed.

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Access matters as much as capacity
Keep blankets, covers and cushions that you can reach without rearranging the room. The opening and interior shape determine what fits. Leave room to lift the lid.
Check usable seating width
Exterior width includes the arms. For two people using it daily, consider seat width, depth and back support too. A compact sofa can suit a studio while feeling cramped as a family’s main seat.
When another shape makes sense
A chaise gives room to stretch out but permanently takes more floor depth. A sofa bed needs extra space when opened. Choose the added function because you will use it.