The Any Bag Camera Bag Insert from Photojojo Store will let you turn any bag, purse or tote into a well-insulated camera bag. Its no longer necessary to search endlessly for the perfect camera bag because you can just slide this insert into any bag large enough to hold it. Its padded and water-resistant to protect your precious cargo and yet discreet — no big flashing NIKON logos letting someone know your expensive SLR resides inside. $59
(Found via Creature Comforts who willingly admitted to stuffing her lenses into old socks before jamming them in her tote until this little bit of genius was discovered)