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sack [sack 词源字典]: sack: English has three separate words sack, one of them now a historical relic and the other two ultimately related. Sack ‘large bag’ [OE] was borrowed from Latin saccus (source also of English sac, sachet, and satchel). This in turn came from Greek sákkos ‘rough cloth used for packing’, which was of Semitic origin (Hebrew has saq meaning both ‘sack’ and ‘sackcloth’).

The colloquial sense ‘dismissal from work’ (as in get the sack) arose in the early 19th century, perhaps from the notion of a dismissed worker going away with his tools or clothing in his bag. Sack ‘plunder’ [16] came via French sac from sacco ‘bag’, the Italian descendant of Latin saccus. This was used in expressions like mettere a sacco, literally ‘put in a bag’, which denoted figuratively ‘plunder, pillage’ (no doubt inspired by the notion of ‘putting one’s loot in a bag’). Sack ‘sherry-like wine’ [16] (Sir John Falstaff’s favourite tipple) was an alteration of seck.

This was short for wine sec, a partial translation of French vin sec ‘dry wine’ (French sec came from Latin siccus ‘dry’, source of English desiccate [16]).
=> sac, sachet, satchel; desiccate, sec[sack etymology, sack origin, 英语词源]
backpack: 1914 as a noun, 1916 as a verb, from back (n.) + pack (n.). Related: Backpacked; backpacking.
gasket (n.): 1620s, caskette, originally nautical, "small rope or plaited coil" used to secure a furled sail, of uncertain origin, perhaps from French garcette "a gasket," literally "little girl, maidservant," diminutive of Old French garce "young woman, young girl; whore, harlot, concubine" (13c.), fem. of garçon (see garcon). Century Dictionary notes Spanish garcette "a gasket," also "hair which falls in locks." Machinery sense of "packing (originally of braided hemp) to seal metal joints and pistons" first recorded 1829.
pack (v.): c. 1300, "to put together in a pack," from pack (n.), possibly influenced by Anglo-French empaker (late 13c.) and Medieval Latin paccare "pack."

Some senses suggesting "make secret arrangement" are from an Elizabethan mispronunciation of pact. Sense of "to carry or convey in a pack" (1805) led to general sense of "to carry in any manner;" hence to pack heat "carry a gun," underworld slang from 1940s; "to be capable of delivering" (a punch, etc.), from 1921. Related: Packed; packing.
package (n.): 1530s, "the act of packing," from pack (n.) + -age; or from cognate Dutch pakkage "baggage." The main modern sense of "bundle, parcel" is first attested 1722. Package deal is from 1952.
unpack (v.): late 15c., from un- (2) "reverse, opposite of" + pack (v.). Similar formation in Dutch ontpakken. Related: Unpacked; unpacking.