Эта тумбочка кажется маленькой, но она очень вместительная: в неё помещаются книги, зарядки и документы.

Тумбочка is a small cabinet or bedside table. Depending on context, it can be a nightstand, a small storage cabinet, or a bedside unit.

It comes from тумба, and -очка is a diminutive suffix. But in modern Russian, тумбочка is often just the normal everyday word, not necessarily an especially “cute” one.

Because тумбочка is a feminine singular noun.

Russian demonstratives and adjectives must agree with the noun in gender, number, and case:

• masculine: этот
• feminine: эта
• neuter: это
• plural: эти

So:

• эта тумбочка
• маленькая тумбочка
• вместительная тумбочка

All those feminine endings match тумбочка.

After казаться meaning to seem, Russian normally uses the instrumental case for the noun or adjective that describes what something seems to be.

So:

• кажется маленькой
• кажется странным
• кажется хорошим человеком

That is why маленькая changes to маленькой.

A learner can think of this as a standard pattern:

• X кажется Y-им / Y-ой

So here:

• тумбочка кажется маленькой

Russian often includes мне кажется when it means it seems to me.

But мне can be omitted if the speaker does not want to emphasize whose impression it is, or if it is obvious from context.

Compare:

• Мне кажется маленькой = It seems small to me
• Кажется маленькой = It seems small

In your sentence, the speaker is making a general observation, so мне is not necessary.

Вместительный / вместительная / вместительное means roomy, capacious, or able to hold a lot.

It does not mean physically large on the outside. That is exactly the point of the sentence: the cabinet looks small, but it can hold many things.

So маленькая and вместительная are not contradictory:

• маленькая = small in size
• вместительная = able to contain a lot

Here Russian uses в + accusative because the idea is that the items fit into the cabinet.

• в неё = into it
• в ней = in it

With помещаться, Russian often focuses on whether something can go inside a container, so в неё works naturally here.

A useful contrast:

• В ней лежат книги. = The books are in it.
• В неё помещаются книги. = Books fit into it.

So в неё highlights capacity: the things can be put inside.

Because third-person pronouns in Russian usually gain an initial н- after a preposition.

So:

• её → у неё, в неё, для неё
• ему → к нему
• ей → с ней
• ими → между ними

This is a very common rule. So after в, you say в неё, not в её.

Because its subject is plural:

• книги, зарядки и документы

These three nouns together form a plural subject, so the verb is plural too:

• помещаются

If there were only one item, you would use singular:

• В неё помещается книга.

Here помещаются means something like fit, can be accommodated, or can be placed inside.

The base verb is related to поместить / помещать. With -ся, the verb often works in a more intransitive way, where the focus is on the items themselves fitting somewhere:

• Книги помещаются в шкаф. = The books fit in the cabinet.

So in this sentence, помещаются is just the normal verb form for fit/go in.

Grammatically, it is:

• present tense
• 3rd person plural
• imperfective

The imperfective makes sense because this is a general fact about the cabinet’s capacity, not a one-time completed action.

Yes, зарядка has several meanings, and context decides which one is meant.

Common meanings include:

• morning exercise
• charging
• charger

In this sentence, because the list is books, chargers, and documents, зарядки clearly means chargers.

This is very common in everyday Russian: people often say зарядка for a phone charger, laptop charger, etc.

The colon introduces an explanation or illustration of the previous statement.

The first part says:

• она очень вместительная

Then the part after the colon shows how we know that:

• в неё помещаются книги, зарядки и документы

So the colon works a lot like:

• it’s very roomy: books, chargers, and documents fit into it

It signals that the second part explains or supports the first part.