The HALO SleepSacks seem to be quite popular, so I picked up one to try out - and I'm glad I limited myself to just one. The pieces came out of the wash slightly warped, but also very worn because the multiple velcro strips fastened themselves anywhere and everywhere, forming a giant knotted ball of material that did not react well to my pulling it apart. This was just a pre-wash before actually using it on my baby, and it already looks like it's been through a dozen uses and washes. Everything is still in tact, thankfully.