Here's the scoop- we live in NH and it's pretty darned cold here about half the year. When you have babies, it can be tricky to keep them warm (yet safe) at night - that's why we all love sleep sacks! The problem, though, is that they don't make them past the XL size (~ 31")... if you're like me and don't feel comfortable letting your kids use blankets until they are ~ 18 months old, you can be out of luck if you have a big kid. We have big kids - I'm talking 99th percentile kids... (I think I have Miracle Grow in my breast milk :))
When Sydney grew out of all of the sleep sacks we had, I made her one and she loved it. Baby #2 (Ben) used the same bag every night and loved it as well. Baby #3... well, I can't seem to find the sleeper (imagine that.... not being able to find one article of clothing in the bazillion boxes of baby clothes I have upstairs), and given that THIS IS OUR LAST BABY (I swear!) I didn't want to buy something new. So I cut up the bottom of the one that he just grew out of and added about 8 or so more inches of some scrap fleece to it. Also added a little RED SOX logo thingy at the upper left part of the sleeper - couldn't resist :)
Now he can roll and grow to his little heart's content, and I can sleep a little more soundly at night :)