Small Rucksack Only to Be Used in Waking Hours?

This page is the CodyCross answer for the clue below from Resorts, Group 558, Puzzle 4 (Complimentary Drinks).

Question is: Small Rucksack Only to Be Used in Waking Hours?

and the answer is: DAYPACK

Word Meaning:

DAYPACK — A small backpack, suitable for a one-day hike or for carrying books around campus.

Definitions from Wiktionary.