皮のショルダーバッグをさがしているのですが。

skin; hide; pelt; fur; rind; peel; husk; bark; shell; sheath; wrapping; mask (hiding one's true nature); seeming

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

shoulder bag

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to search (for something desired, needed); to look for; to search (for something lost); to seek (a suspect in a crime)

be; is

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and