Wilserbrewer is the name of the poster on HBT and
here is his website. I ordered just a grain bag from him (custom fit to my kettle), but he has a hop bag and dry hop bag that he also makes if you want one of those. He also sells a little pulley that should work if you could find a place to tie it up.
Because my pot is only 8 gallons I have had to do sparges to get my boil volume to be correct. It's not a big deal, but it slows down brew day a little and requires you have an extra pot to heat your sparge water. As far as how big you need, you would need to put the information into your brewing software, but with a 10 gallon pot, you could probably fit 15-17# of grain in it for the mash on a 5 gallon batch. 15 gallons would give you plenty of room and then also allow you to make some 10 gallon batches if you wanted, although you would probably have to sparge for those. One drawback to using the 15 gallon for 5 gallon batches will be trying to keep the mash at a constant temperature. That's probably one big advantage using a cooler for traditional all grain has over the BIAB method.
Here are a few additional items I use that I didn't use for extract brewing, which you may or may not already have around the house:
- Extra pot to set grains in after mash - previously just threw the bag in the trash right after the steep
- Extra pot for heating sparge water, if necessary
- Bucket to run cooling water in from chiller before dumping in yard - only used ice baths during extract brewing
- Grain bag
- Blanket to help insulate the pot during the mash
- Bungee cord to hold blanket on the pot
- Binder clips to keep bag from slipping into the pot during the mash
- Something to allow you to drain grains after the mash - pulley system, colander, etc.
Hopefully this gives you a little more information to decide if you might would rather go the BIAB route right now.