1. For tool tote bags, you'll want to look for padded or ergonomic handles with slip-resistant straps. Some have been tested to carry up to 900 pounds - though you won't want to test that yourself!
2. Tool totes come in backpack or sling styles. A backpack tote bag provides better weight distribution on your shoulders and back. Totes are known for large, drop-in storage, but tool totes can come with pockets and slots for easy organization. Look for styles with interior and exterior pockets - some come with as many as 54 pockets - and for zippered enclosures.
3. Tool totes are often made of fabric, so look for something tear and abrasion resistant like ballistic nylon, the fabric used for flak jackets. Since fabric can attract mold, look for tool tote bags with drain holes to let water escape or for a water-resistant treatment.