I have a video for you that you can find at the bottom of my blog post today on my blog HERE. ***If you are getting my post by e mail some server will NOT include the video so make sure to visit my blog to get all detail or you can always find my video on my You Tube Channel.
We did this at the retreat with the standard stamp case then while doing the video I was thinking the wide one would be even better if you have LOTS of embellishments. Here are the size of the designer paper you need 

Standard case (this is the one of the clear stamp or photopolymer)
-7-1/8 x 10-5/8 
Wide case (this is the one of the wood stamps)
-7-1/8 x 11-3/8 

In the video you will see how simple it is to inset that piece of designer paper. If you wish to stamp maybe your on the front you sure can like the top one we did at the retreat. 
For the accordion pocket that is done with envelop. Seal envelop and cut in half  at 2-7/8 and then adhere 5 together but the trick is where you will apply your fast fuse this is very important so you have the accordion all show in the video. 
In the video I show also with the handle on the wide one that recording was live on facebook CLICK HERE to view. 

this show you how the accordion make the envelop deeper again it is all about where you apply the fast fuse all in the video. 

all size embellishment fit well all that you can get at Stampin’Up! my online store even the new one coming out June 1st. 

 Here you can see the difference between the Standard and Wide. If you have lots of embellishment go with the wide. 
Note that each come in a pk of 4. 
Thank YOU so much for stopping by 
Have a great day 

Video↓

[youtube https://www.youtube.com/watch?v=Z3u_F_u6IBc?rel=0?ecver=1]