Every standard size deck has a bag and silk square.
Pocket mini decks just have a bag.
For transportation - if I'm off to a Tarot meetup say, and wish to take a small selection of decks - I might use a toilet bag. These were mostly cheap in the local chemist, with cheery coloured patterns on them.
Some were dirt cheap or freebies, some were expensive.
Some are "proper Tarot bags" with embroidered patterns on them, or patches I've ironed/sewn on. A couple are pencil cases - fluffy colourful ones, or one is in red leather.
Some are satin, some are velvet, some are organza, some are pretty patterned cotton bags with zip, some are linen bags left over from other things I bought (can't remember what now... one had shoe insoles in it... another originally held chocolate coffee beans, some of my small bags were originally supplied for my ipod speaker, or for jewellery items) which I've then dyed.
One is a bag made out of a cheery fleece frog print. One is a gym sock (Everyman Tarot - the originals came like that. a gym sock with the cards bound by a hand-made jock strap). My Sol Invictus deck resides in a green satin bag with Cern Abass embroidered on it - willie-and-all.
Looking at and handling the colourful bag and silk is a pleasurable experience and lends a "special" quality to it all. Or makes me laugh in some cases.
**And - some of my most favourite decks have the addition of a small crystal in the bottom of the bag.
Some are heart-shaped, several are carved in various shapes. My Samhain Deck of the Bastard has a small carved pink and green agate skull, my Dame Fortune's deck - a Chinese jade ox (don't ask me why!!), my Night Sun Tarot has a jasper bear, my Initiatory Tarot of Golden Dawn, an amber snake-shaped pendant I was given and never wear, my Morgan-Greer - a miniature aventurine Ganesh...
Then under my bed I have two large plastic tubs with lids. Everything not currently in use - including extra cards found in packs etc. - go in here.
So what about the vibrator bag? A bag is a bag. If you like it - use it Morrigaine.