Ryobi - 18V ONE+ Hand Vacuum

If you have power tools and are already invested in a battery system then buy a handheld vacuum from that brand. I own Ryobi tools and batteries so I got a Ryobi vacuum and it's so much better than the Black and Decker dust buster that I had before. You can even attach accessories to it. The batteries last a lot longer but more importantly the filter doesn't clog up a minute into the job. The problem is that these batteries are made for heavy duty tools so they're expensive so wait for deals. I think Ryobi Days on Home Depot starts soon.

I use a Ryobi hand vacuum which uses the same batteries as most of my power tools. One 4ah battery is plenty to vacuum out a car or SUV on a single charge, unless it’s a giant mess. I’ve never managed to exhaust a single battery, but I could see someone with a bunch of messy kids needing two. Quite a bit cheaper than the more pro-grade Dewalt and Milwaukee tools others have noted. If you’re not using it every single day, IMO Ryobi is a better deal. Especially if you find sales on refurb or blemished products at Direct Tools Outlet, which is what most of my tools are, they can be half price or less of new price. If it’s something you’ll use heavily, like on a daily basis as a professional detailer, then go with a pro-grade brand like Dewalt or Milwaukee.

Ryobi 18v dust buster

I use the Ryobi, and recently got an HF Hercules with HEPA filter - has a hose, too.

I second shop vac opinions. The Ryobi 18V unit is super nice and you can use the battery and charger with their power inflater for your tires too