If you're searching for something tiny that can still pack a punch, take a look at the Danelectro Hodad lineup or the Fender Mini Deluxe Amp and Fender '57 Mini Twin Amp. These are small enough to carry on the palm of your hand, but they have big voices for their size. They're great amps to keep on a bookshelf in your room or to take to the cabin on vacation. On the other hand, if you're looking for the smallest of the small - an amp that can literally slip unseen into your pocket - check out the Smokey Amp Mini Amp or Plush Gnome Practice Guitar Amp. They don't get any smaller than this!
When you want to rock out in silence, whether you're practicing late into the night or composing a secret Valentine's Day serenade you don't want a certain someone to hear until it's ready, then there's no replacement for a good headphone amp. Many of these are tuned for specific genres. For example, if you're into metal, consider the Rockman Metal Ace or Vox Amplug Metal headphone amps. And if you're a bassist, you can get customized tone from the Vox Amplug Bass or Rockman Bass Ace. These are just a few examples, so it's worthwhile to take a look for yourself and see all the amps that are available to choose from.
The bottom line is that, as much fun as it is to play big and loud, it's not 100% of the time. For the rest of the time, there's the excellent lineup of mini and headphone amps right here in this section. They give you the versatility to go smaller-scale when the situation calls for it, so you never have to go without your guitar or bass just because it's not the right occasion for a full-sized amp.