I use the larger one to hold, a bar, some trailmix, and my MP3 player. There is a hard plastic square piece that's on the end to hold it's shape, but I had to take it out.....As a height-challenged rider, I'm lower to the bar....and as a result the front part of my shorts got caught on the end of the Bento Box....and all I can say is OUCH!!!! That was not nice.....Once I took that plastic piece out it was fine. Otherwise it's a nice little compartment. The velcro works well, and I haven't had any problems with it.

And another Bento story.....Last year on a camping trip to Donner Lake, while I was unloading the truck, some adventurous (sp?) squirrels decided they wanted to see what was in that Bento Box....The bike was leaning on a tree, and they climbed up the bike, chewed through part of the mesh, pulled out the ziplock bag containing Triscuit crackers, then decided they wanted something sweet so the little sh!ts took out 2, yes 2, carboom gel packs out, and chewed through the package....They were the cinnamon apple ones - my fave....They did however leave the little chamois butter tube alone...