Or if you have a small dog the small dogfood tins. Tunafish tins too.
These low profile tins make great little containers for washing small parts or keeping small loose parts in one place while working on your bikes.
Yes the idea seems self evident but if you hadn't thought of it then "you're welcome".
And for those of you that don't have a small pet check on the folks at work. I'll bet there's a handy supply available for the asking.
I just thought of posting this as I washed another out after feeding the feline.