'baglike' is formed in English by combining the noun 'bag' with the adjective‑forming suffix '-like' (from Old English 'līc' meaning 'form' or 'body').

'bag' comes from Middle English 'bagge', ultimately related to Old Norse 'baggi'; the suffix '-like' derives from Old English 'līc' (later Middle English '-like'), which evolved into the modern English suffix '-like'.

Initially it literally meant 'having the form of a bag'; over time this straightforward descriptive meaning has remained essentially the same in modern usage.