Space bag recommendations?

So reading through all the old posts on here, seems like alot of people have used space saver bags.
I own ALOT of hooded sweatshirts, and I'd like to be able to get a bunch over in one go. I'm hoping to only take 3 suitcases and a carry on. Can anyone recommend a good brand or type of spacebag? I wouldn't mind using one suitcase for the 70lb max, and use a spacebag and fill the extra space with shoes and such. I'm investing in a little luggage scale. Anyone use those?

We got these.  They worked well. 

luggage scale was one of the best things we've ever gotten.  We use it on every trip.

We got these.  They worked well. 

I got those, as well.  I found them to be a little tricky to get to work at times (the instructions on the pack aren't the greatest), but once I'd figured it out, they worked wonders.

Ooh who are you flying with that still has a 70lb limit?

70lbs for overweight luggage. 50 for regular.

Just got our stuff and the space bags were still sealed and air tight 3 months later.