Reddit reviews Household Essentials 35704-1 CedarFresh Clothes Protector and Storage Accessories Value Pack (71 Items)

I was just as surprised as you that I hadn't heard about this sooner. Dealing with allergies in a humid region and living mostly in older houses it had never even been mentioned.
When I moved into this house I needed extra storage options. I prefer to redo old sturdier furniture and happened across a chest at a sort of consignment shop that wasn't great on the outside but when I checked the inside it was immaculate, smelled amazing and even had the manufacturers tags. It turned out to be a Lane cedar chest not a super antique one but still solid cedar and almost brand new inside. After fixing up the outside a bit and storing extra bedding and things in it for a couple weeks I noticed how aromatic it still was but also the items I'd stored in it. I got curious and decided to look more into it.
Cedar wood I found has been being used to store and protect cloth items for centuries. I don't understand how this stopped being common place let alone how it was replaced by moth balls. It protects from bugs but also mold and mildew which keeps away the musty smell you usually can't avoid when storing cloth items.

Just to share some of what I've found in the past couple years if you interested...
As others have mentioned there are plenty of options for adding a bit of cedar to closets, drawers, or cabinets. From the plank in the main post, circular cuttings made to go over hangers, sachet style bags filled with shavings that can be refreshed using cedar oil, and tons more. (Here is a great set with a little of each, https://www.amazon.com/gp/aw/d/B00DEF8KCI/ref=pd_aw_fbt_201_img_2?ie=UTF8&psc=1&refRID=63BW1DPGEC5DNEHVDDCM )
You can go a step further and replace the rod with a cedar one like you mentioned or replace the shelves in a closet or cabinet with cuts of cedar. You can even go all out and redo the whole closet with cedar.
When sticking with the little pieces I find the best bits to add are ones you can easily refresh like square pieces that will be easy to sand down a bit and the sachets you can just refresh with oil.
I also found Red cedar is what's used and recommended for this purpose. It's suppose to be the most aromatic and longest lasting.

Snippet from a webpage with the basics. Most others were biased towards specifics...

Cedar Products offer natural protection against damage from moths, mildew and mustiness. The aroma of cedar repels adult moths from wanting to enter that environment to lay her eggs. The amount you need depends on the size of the container and how frequently it is opened and exposed to air and light. If you can smell it, so can the moths. You can rejuvenate aging cedar by spraying with cedar mist or by rubbing the cedar with sand paper to revive the scent. You can also use sachets, blocks, balls and hangers to allow you to add cedar easily. Cedar also helps absorb dampness and odors. Cedar, which comes in hangers, boxes, blocks and drawer liners, should be sanded with fine-grade sandpaper after each season because otherwise the surface oxidizes, eliminating the moth repelling scent.

TL;DR - Cedar is freaking awesome! Enjoy the tidbits of info I've come across in my research if you care to. 🤓

http://www.amazon.com/gp/product/B00DEF8KCI/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1

It was pretty cheap, and came with a lot of pieces.

For yarn storage, I use a cedar chest in my room. For knitted items I keep them in a box with these cedar pieces.

Be careful with mothballs, though! (Sorry, I don't mean to be a party pooper). It can be difficult to get their smell out of yarn. From what I have read, strong-smelling cedar and lavender can work just as well. Another downside to mothballs is that they will react with any plastic they are in contact with - which is partly why I opted not to use them with my bin system. This article helped me a bit when I was trying to figure out a storage system.

I also purchased this set of cedar things from Amazon. I thought it was a really good deal! I also purchased some cedar oil to rub into the cedar blocks when they lose their smell.

I used the orange stuff (down every drain) and I put out cedar chips (because I thought that they were moths), just in case. I also started covering the drains when they were not in use. I haven't seen anything since April. I'm wondering if I should do another round of treatment.

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https://www.amazon.com/gp/product/B005G4STX0/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

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https://www.amazon.com/gp/product/B00DEF8KCI/ref=ppx_yo_dt_b_asin_title_o04_s00?ie=UTF8&psc=1

This is the product I am using:

Household Essentials 35704-1 CedarFresh Clothes Protector and Moth Repellent Storage Accessories Value Pack (71 Items) https://www.amazon.com/dp/B00DEF8KCI/ref=cm_sw_r_cp_apa_i_Wm9DCb12QVP75

I read everything that came with it, it says 100% chemical free?