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Yuki is usually seen equipped with a pink backpack that has wings attached to both sides– and sometimes, a bottle of water attached with a carabiner.
In chapter 1 (and episode 1), after Yuki finishes her club activities, she realizes that she had realized that she had left her backpack in her classroom. From this, she runs back to go get it.
In chapter 10, after Yuki found the crime prevention buzzers, she attached them to her backpack.
In chapter 11, Rii-san had used the crime prevention buzzers, attached to Yuki's backpack to buy them extra time to rescue and escape with Miki from the mall.