pack、package、packet、parcel、bunch与bundle这些名词均有“捆，包”之意。

pack : 指专为背负而包扎的包裹，也指驮物等。

• donkeys carrying packs of wool
  驮着成捆羊毛的驴
• Everything she told us is a pack of lies.
  她所说的全都是一派谎言。

package : 指包装整齐严密的包裹或一包、一捆、一盒东西。

• Check the list of ingredients on the side of the package.
  请检查包装盒侧面的成分清单。
• a package of hamburger buns
  一袋做汉堡包用的圆面包

packet : 一般指小件行李、邮包、还可指更小一些的包。

• a packet of biscuits/cigarettes/crisps
  一包饼干 / 香烟 / 油炸土豆片
• A packet of photographs arrived with the mail.
  一包照片邮寄来了。

parcel : 着重指邮包，也指将东西扎成小包或不太大的包。

• There's a parcel and some letters for you.
  有你的一个包裹和几封信。
• She was carrying a parcel of books under her arm.
  她腋下夹着一包书。
• The prisoners were allowed food parcels.
  囚犯可以收食物包裹。

bunch : 指有规则地把同类东西固定在一起。

• a bunch of bananas/grapes, etc.
  一串香蕉、葡萄等
• a bunch of keys
  一串钥匙
• She picked me a bunch of flowers .
  她给我采了一束鲜花。

bundle : 指多件东西被捆扎在一起。

• a bundle of rags/papers/firewood , etc.
  一捆碎布、报纸、劈柴等
• She held her little bundle (= her baby) tightly in her arms.
  她怀中紧紧地抱着襁褓中的婴儿。