I have the LW external frame. First bag lasted 14 years, frame never bent. Not sure what people are doing to bend them. Only replaced the bag because the outside was tore up. I bought the newer version and have had it for 3 years. Still looks new, frame isn't bent. I sent the other bag in for refurb. They discontinued it. So they sent me the newer version for the $179 refub fee. I won't have to buy another bag until I retire. Look at the weights. The SB and LW bag are fairly close. If a couple of pounds prevents one from lifting a bag. You might want to start working out. LW also makes one with a small side pocket on the top of one side. I like that about my bag.