Chain slipped and stuck
 

Took my D7 for first time in over 2 months and when I was shifting down (after getting on a MUP with walkers and roller bladers), chain slipped and got stuck between highest gear and drop out. This occured without my tool bag with me. I would have needed screwdriver to pry the chain or adjustable wrench to loosen the wheel. The walk home would have been an easy 6 miles. I walked the bike for a mile heading home and then gave it one last attempt to remove the jammed chain. I tried pulling the chain up, down and sideways with brute force until it finally snapped out. I would still be walking home now if it did not work. Anyone have the chain jumped out of gear and stuck between cassette and dropout? Does anybody bring a tool bag equipped with basic tools when you ride? I usually do when my ride is beyond 10 miles and I didn't expect to be riding more than that but it happened after I had 21 miles.

Yes, I usually ride with basic tools, which include a 6" adjustable wrench, a multi-bit screwdriver, a chain tool, a spoke wrench, an extra tube and a multi-tool made for bicycles... It's saved me from walking back home once when my chain broke. I was able to reconnect it and ride back home... It weighs nothing, and it's a great peace of mind.

I've had chains get badly snagged around the bottom bracket area when my front mech was wrongly adjusted. It can be a real pain around there, because it often happens under hard pedaling and can snag up very badly. You'd hardly think the pedaling would be an issue since the cahin was coming off the front sprocket, but it has been. I think its's been half off and half on when the damage was done.

If I'm going further than I'm prepared to walk, I usually carry a few tools - sometimes a lot if I'm on one of my forty mile rides that I'm doing regulalrly now. Fortunately, if you're a folder rider, you can always call a taxi to be taken home. Otherwise, if you need those tools and you haven't got them, you'll be severely inconvenienced. You can get small toolkits that weigh not much and can get out of most troubles quite easily by using them.

Multi tool - (set of hex keys, screwdrivers and chain tool)
3 good plastic tyre levers
adjustable spanner
spare tube
puncture kit
mini pump
plastic tie wraps
Insulating tape

Mayby the rear derailer needs a bit of adjustment - it shouldn't really throw the chain off. But having a low end derailer may also be the cause despite good adjustment.