I Spy....
I've been coveting these little bags on Etsy for a long time now and finally (poor Ace has been begging for months) decided to just make my own. I started collecting little doodads around the house and saving some of the little things he collects (that we never have anything to do with) to put inside.
They're called I Spy bags. You put 20-30 little items inside with a list on the back of the bag. We love playing this game and so these are great! They are also terrific because they don't make a sound (the bag not the kids)! Here's what you need to make one of these.
2-8 inch squares of flannel - 1 yd. $5.99 -40% off=$3.59 (enough for 6-7" bags)
4 inch piece of plastic, about 4mm thick - 1/2 yd. $3.49=$1.75
poly-pellets used to fill dolls - $6.99 for a 32 oz. bag (enough for maybe 4 bags;I should have waited for a coupon)
little doodads (doll house items, decorative buttons, etc) $9.50 (WAY too much but I have enough for about 6 bags now)
printable fabric (I used cotton twill; 6 sheets are enough for 18 bags) $9.99 -40% off= $5.70
So basically it cost about $6.00 for one bag. I bought the extra because I made some for gifts and am going to sell some on Etsy. If anyone is interested let me know and I'll give ya a discount ;)
Directions:
Measure and cut with a rotary cutter a 16" (width) x 8" (height) rectangle. I did this to have one less seam to worry about coming open.
Iron fabric flat with 1/2 inch seam all the way around. I also folded the fabric in half and ironed the seam so I knew where to center the front window.
Find a square object (I used a post-it note box) or measure a 3" square window and trace it. Use rotary cutter to cut out.
In Word, type a list of all the items you're putting in the bag. Choose your font and print a test sheet before printing on your fabric (that stuff's expensive!) Measure it on the back of your bag leaving about a 1" border to sew on. Once your satisfied print it out and follow the directions on the package. 
I kept the test sheet, cut it out and laminated it for myself to keep in my wallet. My little guy can't read yet so I can help him by reading the things off.
Cut a 4" square out of the plastic.
Sew the plastic window in, I did 2 rows of running stitch and then a zig-zag around. I have a choking phobia so I wanted to make sure these puppies wouldn't bust a seam. Test first because I had to pull it out once due to the plastic sticking to the machine. I just went really slow and it was o.k.
Sew the list on the back using zig-zag stitch so it doesn't fray. (see pic)
Pin edges together with right sides facing. Sew together leaving about a 2-3" opening to turn right side in and add do-dads and pellets. Flip right side out and sew zig-zag around edges to secure seams. (Remember to leave your opening!) 
Add doodads and then pellets. I filled up to top of window only. You want them to be able to move the items around to find them. Only fill it up as high as you have to, I think I may add a tad bit less next time. 
Sew up opening with matching zig-zag and Voila! You have your very own "I Spy..." bag!
NOTE:
I've been buying the supplies slowly with 40% off coupons from Hobby Lobby, Jo-Ann's and Michael's and that really cut the cost. I should have used a few more though. You can sign up for their coupons in-store or print Hobby Lobby's out online!