If you subscribe to a kit...

Depends on the kit and what I am going to use it for.

I tend to store the kit as a kit until it is at least partially used. It is often easiest to grab items from the kit for a 2 page spread, or even a series of pages. And a kit may actually inspire the LO.

But I love when a kit or a new collection works well with my stash, so I will often add little things not from the kit to my project once it is put together. And while the kit may still stay together in its pkg for awhile, it will often be stored away with other materials of a similar theme or colour scheme. Later, they may all end up in the same bin (ie Springtime, or Flowers, or Fairies, or...)

I get kids from Ali Edwards and Elle's Studio (aka no paper kits) I take a look at my kids when they first come and plan any pages w/ them, kits intact. Then, I split the kit into my stash.

I bring in existing stash. I love my Felicity Jane kits but the embellishments aren't as dimensional as I'd like. I see the kit as a starting point.

I do the same.

I get Elle's Studio, Ali stamp & kit, and Hero Arts

I always try to do 1-2 things with mainly just the kit and then I'll mix in more for other projects.

I usually will add cardstock to it, but that's about it. I will use my punches and Cameo.

Silly question, but do you just bag the items together when you make a kit? 

Yes I do. The only thing I dont put in the kit is buttons, ribbons, brads, and eyelets. I have them in separate storage. But everything else like diecuts or enamel dots or stickers I bag all together. I am a simple scrapper. I also scrap 8 1/2 x 11. So I find I use a lot fewer things these days.