Metro straps do fall off the should sometimes. I own the medium, which is a big bag. I find that if I take the strap furthest from my neck and tuck it under the other strap so that they crisscross and the one near my neck is now on top and on the outside, that they don’t slip off my shoulder. I also know that amazon sells purse gummies and some mzw fans have used those on the metro straps.
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Mom to two amazing DDs ('07 & '09) and a fur baby.
Gluten free since Nov '11 after non-celiac gluten sensitive diagnosis. Have had great improvement or total elimination of: migraines, bloating/distention, heartburn, cystic acne, canker sores, bleeding gums, eczema on elbows, dry skin and scalp, muscle cramps, PMS, hair loss, heart palpitations, fatigue. I'm amazed.