This is the 9996th most frequent Russian word.
аптечку
A first aid kit.
The term 'аптечку' is used here in the accusative case as it is the direct object of the verb 'собрала' (packed), highlighting the action taken regarding the kit.
Я собрала аптечку для похода.
I packed a first-aid kit for the hiking trip.
Here 'аптечку' is also in the accusative case, part of the imperative construction pointing to the necessity of bringing the item mentioned.
Не забудь аптечку, она может пригодиться в дороге.
Don't forget the first-aid kit; it might come in handy during the trip.
In this sentence, 'аптечку' is again in the accusative case, linked to the verbs 'держим', showing the maintenance status relative to the first-aid kit.