Tent falls in Class 22, ropes & tarps, and depending on what exactly you sell it can also fall in Class 6 or Class 20 or Class 12. Everything below is read from the USPTO's own list of accepted descriptions, not from an opinion about where it belongs.
Searching the USPTO Trademark ID Manual for tent returns 33 accepted descriptions, and most of them sit in Class 22. The manual is the list of identifications the office has already approved, so wording taken from it is pre-approved and settles the class at the same time.
The class follows from the identification you write, so "what class am I in" is really "what exactly do you sell". How the class system works covers the rest.
Ropes, nets, tents, tarps, sacks, or raw textile fibers.
15 accepted descriptions in the manual mention tent. For example:
Common metals or metal building materials and hardware.
4 accepted descriptions in the manual mention tent. For example:
Furniture, mattresses, mirrors, or picture frames.
3 accepted descriptions in the manual mention tent. For example:
Vehicles or parts for traveling by land, air, or water.
3 accepted descriptions in the manual mention tent. For example:
Tent appears in 4 classes because what you make, what it is made of and the service of selling it are separate classes. Pick the descriptions above that match what you actually do.
Making tent is Class 22; a shop or online store that sells it is retail store services (Class 35), and a business that does both files in both.
Ropes, nets, tents and raw textile fibers. Once fiber is spun it moves on: yarn is Class 23.
The class decides what a registration covers; it does not decide whether the name is available. Relatedness is judged on the identifications, so a conflict can sit in a class you never looked at: the same name in a different industry.
Check whether your name is clear for tent Searches the live USPTO register, including sound-alike and meaning-alike names. First search $2, then $5.Tent sits in Class 22, ropes & tarps. That is where the USPTO's own ID Manual puts it: 15 accepted descriptions mentioning tent fall in Class 22. Depending on exactly what you sell it can also fall in Class 6 or Class 20 or Class 12.
You file in every class you actually use the mark in, and the USPTO charges its fee per class. Selling a product and also running an online store for it is two classes, not one. Filing in classes you do not use is worse than filing in too few: an application has to be supported by real use or a genuine intent to use.
No. The class decides what a registration covers. Availability turns on whether someone already holds a similar mark for related goods, and relatedness is judged on what the identifications say rather than on the class number, so marks in different classes can still conflict.
Not what you sell? Search the class finder for your own wording, or browse all 45 classes.