Can I Keep Shards for a later use?

Hello!

I just got a 150 Shards from an Apex Pack.  I main 3 Legends, but only one (Wraith) has Hairloom available, and that one I already have.

My question: can I keep these shards to when one of my other 2 legends gets an Hairloom?

Thanks for the feedback! 🙂

All the best!