Друг чуть было не потерял трекинговые палки.

Чуть было не means almost or came close to doing something.

So:

Друг чуть было не потерял трекинговые палки.
= A friend almost lost his trekking poles.

This expression often suggests that the action nearly happened, but in the end it did not.

This is a very common point of confusion.

In Russian, чуть было не + verb is a fixed pattern meaning almost did. Even though it contains не, the whole expression does not simply mean ordinary negation.

So:

• потерял = lost
• не потерял = didn’t lose
• чуть было не потерял = almost lost

You should learn чуть было не as one chunk.

Yes, they are very close.

• чуть не потерял = almost lost
• чуть было не потерял = almost lost

The version with было can sound a bit more expressive or a bit more literary/conversational depending on context. It often emphasizes that the event was really close to happening.

In everyday speech, both are common and natural.

Because Russian is using the perfective verb here.

• терять / терял = imperfective, to be losing / to lose repeatedly / to lose in a general process
• потерять / потерял = perfective, to lose as a completed event

With чуть было не, Russian usually refers to a single near-event, so the perfective verb is natural:

• чуть было не потерял = almost lost

The idea is: he came very close to one specific completed result — the poles being lost.

Потерял is:

• past tense
• masculine singular
• perfective

It agrees with друг, which is a masculine noun.

So if the subject were feminine, you would say:

• Подруга чуть было не потеряла трекинговые палки.

And if it were plural:

• Друзья чуть было не потеряли трекинговые палки.

Russian has no articles, so друг can mean:

• a friend
• the friend
• my friend (if context makes that clear)

The exact English translation depends on context.

By itself, Друг чуть было не потерял... most naturally becomes something like:

• A friend almost lost the trekking poles or
• My friend almost lost the trekking poles

If this sentence appeared in a story where the friend was already known, the friend might also be possible.

Grammatically, друг is masculine, so it usually refers to a male friend.

For a female friend, Russian normally uses:

• подруга

So:

• Друг чуть было не потерял... = A male friend almost lost...
• Подруга чуть было не потеряла... = A female friend almost lost...

However, in some contexts English may simply say friend without emphasizing gender.

It is in the accusative plural, because it is the direct object of потерял.

The base form is:

• трекинговые палки = trekking poles

For inanimate plural nouns, the accusative plural is the same as the nominative plural, so the form does not change here.

Compare:

• Nominative: трекинговые палки лежат у двери.
  The trekking poles are lying by the door.
• Accusative: Он чуть было не потерял трекинговые палки.
  He almost lost the trekking poles.

Because палки are inanimate, the forms match.

Both are possible, but трекинговые палки is a very natural compact way to say trekking poles / hiking poles.

Here:

• палка = stick, pole
• трекинговый = trekking-related

So literally it is something like trekking poles.

Russian often uses adjectives like this where English might also use a noun modifier.

The word order is natural and neutral:

Друг чуть было не потерял трекинговые палки.

This starts with the subject друг, then the expression чуть было не, then the verb, then the object.

Russian word order is flexible, so other orders are possible for emphasis, for example:

• Чуть было не потерял друг трекинговые палки.
• Трекинговые палки друг чуть было не потерял.

But those would sound more marked or context-dependent. The original order is the safest neutral version.

It can be used with many verbs. It is a general pattern meaning almost did something.

Examples:

• Я чуть было не упал. = I almost fell.
• Она чуть было не заплакала. = She almost started crying.
• Мы чуть было не опоздали. = We almost were late / We almost arrived late.

So in your sentence, it is just the same structure with потерял.

A very natural translation is:

• My friend almost lost his trekking poles.

Other possible translations depending on context:

• A friend almost lost the trekking poles.
• My friend nearly lost his hiking poles.
• A friend came close to losing the trekking poles.

If there is no context, A friend almost lost the trekking poles is a safe literal-style translation. If the speaker is clearly talking about their own friend and that friend’s poles, My friend almost lost his trekking poles is often the most natural English version.