The story
- Proto-Indo-European*bʰeg-der.?
- Proto-Germanic*baką
- Proto-West Germanic*bak
- Old Englishbæc
- Middle Englishbak
- Englishback
- Proto-Germanic*pakkô
- Proto-West Germanic*pakkō
- Old English*pæcca?
- Proto-West Germanic*pakkō
- Old Dutch*pakko
- Middle Dutchpakbor.?
- Middle Englishpak
- Englishpack
- Englishbackpack
- English todaybackpacking
Etymology from Wiktionary, CC BY-SA 4.0.