I had an issue getting through a day at trade shows and then got one of these: http://amzn.to/cx8u6p http://amzn.to/cx8u6p I spent about $30 on it and now its

I had an issue getting through a day at trade shows and then got one of these: http://amzn.to/cx8u6p http://amzn.to/cx8u6p I spent about $30 on it and now its only $20 money well spent.