Does anyone have any ideas on how one could create a speedo pocket?  Something to carry your mobile and keys maybe?

I’m lucky enough to be right on the beach so when I go for a quick dip like I did first thing this morning, I just walk across the sand and then walk back, no need to lock the doors or anything.  When I go up to Birdie Beach I normally have a pack with me to store that stuff.  But what if one day I gained enough courage to walk down to Terrigal and grab some bread and milk?  I’d have to carry my mobile and a credit card.

Would love to hear any ideas you guys might have.

I like the guy on the right in this pic with his mobile down the front of his speedo.