I use the Lowepro Mini Trekker as well. I carry a Pentax 67 with 55mm lens attached. I also carry a 105mm and a 150mm lens, an extra viewfinder as well as a pentax spotmeter. I also carry a holga for those special shots. I have room for a bunch of filters, film, etc. The bag has held up very well and isn't as heavy as I thought it would be!!