The clasp on the front is VERY secure. It's actually a little difficult to open at times but there hasn't ever been a time that I haven't been able to get it open. The strap hangs down about 1.5-2 feet or so. Which is a perfect length. It's also adjustable and can be unclasped from both ends in the even that you want to remove it.
The inside is very well padded and has a removable velcro insert so you can adjust to snugly fit your camera. It's fairly roomy if you don't have a massive camera with the big lenses. I tested it with a Nikon Coolpix L610 and I could have probably fit 2 of them in the case with the insert in too.
The zipper pocket on the front flap is about 2in by 3in, though the opening seems slightly small. The two pockets on the sides both have velcro (for easier access) and button snaps for a more secure closure.
This camera bag is very well made and very durable. The outside material looks like it would be rough but it is actually very soft. I actually love this bag and highly recommend it!