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a backpacker who + clause
who 引导定语从句修饰 backpacker，说明是哪一类背包客。
A backpacker who travels on a budget usually stays in hostels.
预算有限的背包旅行者通常住青年旅舍。
背包旅行者；背包客
先理解核心含义，再看它在真实句子里的用法。
背包旅行者；背包客
A traveler who carries their belongings in a backpack, especially one who travels on a budget using hostels, public transport, etc.
A backpacker who travels on a budget usually stays in hostels.
预算有限的背包旅行者通常住青年旅舍。
背包旅行者,尤指利用旅舍、公共交通等廉价服务的旅行者。
A traveler whose luggage consists of a backpack; especially, such a traveler who uses hostels, public transport, and other inexpensive services.
背着背包的徒步者
a hiker who wears a backpack
供背包客住宿的旅舍。
A hostel offering accommodation for such people.
The backpacker set up his tent near the river after a long day of hiking.
经过一整天徒步旅行后，这位背包客在河边搭起了帐篷。
Many young backpackers travel through Europe on a tight budget.
许多年轻的背包客预算紧张地游历欧洲。
She met another friendly backpacker at the hostel and they decided to explore the city together.
她在青年旅舍遇到了另一位友好的背包客，决定一起探索这座城市。
who 引导定语从句修饰 backpacker，说明是哪一类背包客。
A backpacker who travels on a budget usually stays in hostels.
预算有限的背包旅行者通常住青年旅舍。
backpacker 是可数名词，复数形式为 backpackers，谓语动词用复数。
Backpackers often use public transport to save money.
背包旅行者通常乘坐公共交通来省钱。
backpacker 可作定语，表示“为背包客提供/适合背包客的”。
We stayed at a cheap backpacker hostel near the station.
我们住在车站附近一家便宜的背包客旅舍。
as a backpacker 表示“以背包客的身份”，常与 travel 等动词搭配。
She traveled around Europe as a backpacker.
她作为背包旅行者游遍了欧洲。
Not this
She is backpacker and travels around Europe.
Use this
She is a backpacker and travels around Europe.
backpacker 是可数名词，单数形式前需要冠词 a/an；汉语没有冠词概念，所以学习者容易漏掉。这里指“一名背包客”，需加 a。
Not this
I like backpacker because it is cheap.
Use this
I like backpacking because it is cheap.
backpacker 指“背包客”（人），表示“背包旅行”这一活动要用动名词 backpacking 或动词短语 go backpacking。原句把表人的名词当作活动，属于词性/词义混淆。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
独自背包旅行者；独行背包客
The trail is popular with solo backpackers.
这条徒步路线深受独自背包旅行者的欢迎。
预算有限的背包客；穷游背包客
Budget backpackers often stay in hostels to save money.
预算有限的背包客常住青年旅舍以省钱。
经验丰富的背包客
Even seasoned backpackers can get lost in this wilderness.
即使是经验丰富的背包客也可能在这片荒野中迷路。
背包客旅舍；背包客栈
We booked a bed at a cheap backpacker hostel near the station.
我们在车站附近一家便宜的背包客旅舍订了张床位。
背包客路线；背包徒步小径
The Annapurna Circuit is a classic backpacker trail in Nepal.
安纳布尔纳环线是尼泊尔一条经典的背包客徒步路线。
背包客的生活方式；背包旅行生活
He embraced the backpacker lifestyle after quitting his job.
辞职后他过起了背包客的旅行生活。
Use backpacker naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把包（pack）背（back）在身上旅行的人，就是backpacker背包客，常住青旅、搭公共交通。
语域：neutral 常见场景：travel writing、hostel accommodation、outdoor recreation 「backpacker」是中性常用词，通常用于旅行、住宿和户外活动场景。它主要指背包旅行者，尤其是不讲究奢华、使用旅舍和公共交通的旅行者；有时也指徒步者或背包客旅舍。日常口语和书面描述中都很自然，没有明显的正式或非正式色彩。
Packer, tracker and attacker all share the final /ækə/ sound with backpacker and rhyme with it. Hiker, trekker and hitchhiker are useful spelling or meaning lookalikes, but they do not rhyme with backpacker: hiker and hitchhiker contain /aɪ/ instead of /æ/, and trekker has /e/ instead of /æ/.
Dictionary facts from ECDICT, WIKTIONARY.