Is safe to reuse plastic bags used for sous vide Is it safe to reuse plastic bags used for sous vide?
And if it's safe, any special measures apart from the obvious need of cleaning them.

PD: I mean plastic bags specially designated for sous vide that work with a manual vacuum pump like that
There is not safety issue as long as you clean well. It shouldn't be a problem after most cooks.  If using high heat...or very long cooks, you might check the integrity of the bag.  Otherwise, I suppose you could wash and dry.  I mainly use zip lock-type bags and discard after each cook, simply because they are a p-i-t-a to clean.