Securtex Anti-Theft Vacation Backpack

[This review was collected as part of a promotion.] I bought this for two upcoming European trips. I usually only carry a crossbody purse but I find sometimes I want to carry more, like a light jacket or my 35mm camera. I searched hours on line for a small backpack that had security features, in particular a place for cash and cards that was against my back when wearing it. Amazing how something that is a no-brainer to me isn't a feature in most backpacks. I love all the zipper locks on this bag and it it is just the right size. Only problem I haven't solved is finding a refillable water bottle that fits in the side pocket. A 16.9 plastic bottle fits perfectly but anything larger doesn't. It would be nice if those pockets had a pleat or elastic that allowed a somewhat larger bottle to fit.