With retainers and mouthguards, nothing is worse than losing your case and having to put it directly in your book bag, gym bag or a plastic baggie. The retainer case twin pack gives you 2 sturdy cases, one for your bedside or bathroom at home and another for your bag on the go. The snap lock design has tight locking closure with a secure snap, letting you know your case won't come open unexpectedly. Design works with most dental health care products, such as retainer, invisalign, hockey & sport mouthguard storage. Crafted of BPA free, FDA approved plastic, made in the USA. We stand behind our products- if you have any problems with this item within a year of purchase, we will replace free of charge.