I love this video from the Will Leather Goods website on the making of their Tribeca Film Festival bag. This is a "T-Bottom" style tote - about the most simple bag pattern you can make but they've added some nice details. This video is a great overview of small-scale factory made bags - die cutting, sewing, strap making, setting rivets,etc. Check it out:
Will x Tribeca Film Festival from Will Leather Goods on Vimeo.