knapsack

/ˈnæpsæk/

//ˈnæpsæk// noun

By · According to Wiktionary data (CC BY-SA) ·

"knapsack" is a 8-letter English headword indexed on PlainSpell.

The verdict

“knapsack” is uncommon English (frequency #58,797 among 1,236 “K” headwords), classed as a noun. The kind of spelling people second-guess.

#58,797
frequency rank, English
1,236
“K” headwords

According to Wiktionary data (CC BY-SA, analyzed September 3, 2026) - A case of canvas or leather, for carrying items on the back.

Corpus desk

Index EN-knapsack · knapsack · English

knapsack · rank #58,797 · 0 variants · 0 confusables

  • FREQ-RARE #58,797
  • LEN-LONG 8 letters
  • VOW-2 2 vowels
  • CONFUS-0 No pairs
  • VAR-0 0 variants
  • BOOK-MID 1,236
  • PHOTO-FINISH Kovac

Nearest frequency peer: Kovac (+2 rank slots)

Read with this headword: Spelling guide for this pattern

Desk codes from Wiktionary headword shape, FrequencyWords rank tier, confusable-pair count, generated misspelling depth, letter-cohort book size, and photo-finish peer. Not a difficulty grade.

Long-tail ranks near “knapsack”

Sparse band: bars invert rank so rarer forms read shorter

corpus weight

What this shows Long-tail view: where “knapsack” sits against similarly uncommon English ranks.

Source FrequencyWords open word-frequency list As of September 3, 2026
Key facts for knapsack
PropertyValue
Headwordknapsack
LanguageEnglish
Part of speechNoun
IPA/ˈnæpsæk/
Letters8
Frequency rank#58,797
Misspellings tracked0
Confusable pairs0
SourceWiktionary (kaikki.org)

Long-tail rank of “knapsack” in English

Every-word frequency runs from the handful of words we use constantly (left) to the long tail used once in a blue moon (right).knapsackfalls in this rarity band:

#1#100#1K#10K#100K
← used constantlyrarely used →

Ticks step logarithmically, so each one marks a roughly tenfold drop in how often the word turns up. Rare peers in the same band: “Kovac” (#58,799), “Khaleesi” (#58,794), “keke” (#58,792). Among 1,236 “K” headwords, “knapsack” is #58,797. Source: FrequencyWords open word-frequency list.

Rare enough to double-check

knapsack is uncommon English at frequency #58,797 among 1,236 “K” headwords, classed as anoun, transcribed /ˈnæpsæk/. Rarity is why readers land here mid-draft. 2 senses are on record.

The misspelling generator found no plausible variants for knapsack, since its letter pattern doesn't lend itself to common typo substitutions. No confusable counterpart is on file for this word, which tends to mean the word is visually distinctive enough to stand on its own.

Etymologically, the entry records: From Low German knapzak or Dutch knapzak (older form cnapsack), from Middle Dutch cnappen (“to bite with teeth”), ultimately from knappen (“to eat, crack”), of imitative origin, + sack. German Knappsack is from Dutch. The correct English form is knapsack, spelled K-N-A-P-S-A-C-K.

Definition

  1. 1
    A case of canvas or leather, for carrying items on the back.
  2. 2
    A set of values from which a subset is chosen.

Recorded use

Wiktionary examples

These source excerpts show how knapsack appears in context. They illustrate usage; the definition above remains the entry’s reference meaning.

  1. 1936, Arthur Ransome, Pigeon Post, ch 3. "All but Nancy carried knapsacks, with sandwiches and thermos flasks of tea. Peggy’s knapsack held Nancy’s provisions as well as her own, for on Nancy’s shoulders, instead of a knapsack, was a pigeon-basket […]"
  2. The two elder reluctantly left him and walked on, taking their brother's knapsack to relieve him in following, and the youngest entered the field.

Etymology

From Low German knapzak or Dutch knapzak (older form cnapsack), from Middle Dutch cnappen (“to bite with teeth”), ultimately from knappen (“to eat, crack”), of imitative origin, + sack. German Knappsack is from Dutch.

Synonyms

backpackrucksack

This word in other languages

morral(Español)sac à dos(Français)Rucksack(Deutsch)

Definitions, pronunciation, and etymology for this entry are drawn from Wiktionary via the kaikki.org structured extract (CC BY-SA); frequency ordering uses the FrequencyWords open word-frequency list (2018 English corpus, MIT). See the methodology for how each field is sourced and updated.

Frequently Asked Questions

How do you spell "knapsack"?
"knapsack" is spelled K-N-A-P-S-A-C-K. The IPA pronunciation is /ˈnæpsæk/.
What does "knapsack" mean?
As a noun, "knapsack" means: A case of canvas or leather, for carrying items on the back.
How do you pronounce "knapsack"?
The IPA (International Phonetic Alphabet) transcription for "knapsack" is /ˈnæpsæk/. Click the speaker icon on the pronunciation badge above to hear it spoken aloud where audio is available.
What is the origin of the word "knapsack"?
From Low German knapzak or Dutch knapzak (older form cnapsack), from Middle Dutch cnappen (“to bite with teeth”), ultimately from knappen (“to eat, crack”), of imitative origin, + sack. German Knappsack is from Dutch. See the full etymology section above for more details.
Is PlainSpell free to use?
Yes, PlainSpell is a completely free word reference. You can look up definitions, pronunciations, confusable pairs, homophones, and spelling corrections across 5 languages without any sign-up or subscription.

Similar English words by spelling shape

Same letter count and similar misspelling depth for "knapsack", not the corpus desk frequency band.

Same letter count

Frequency-ranked English headwords with 8 letters (nearest by frequency rank).

Khaleesi#58,794Kankakee#58,788jiggling#58,783jailbait#58,777

Source: Wiktionary (via kaikki.org) Structured Wiktionary extract

Source: FrequencyWords open word-frequency list